Herons

19th July 202016th August 2025 By Simon

Words for heron and related creatures in Celtic languages.

Words marked with a * are reconstructions.

Proto-Celtic	korxsā / korxsiyos = heron, crane
Celtiberian	*cárcia = heron
Gaulish	curcio- = heron
Old Irish (Goídelc)	corr = crane, heron, stork, crane
Middle Irish (Gaoidhealg)	corr = (grey) heron, stork, crane, leg-necked person
Irish (Gaeilge)	corr [kəuɾˠ] = (grey) heron, stork, crane, leg-necked person
Scottish Gaelic (Gàidhlig)	corra [kɔr̪ˠə] = heron, stork, crane
Manx (Gaelg)	coar = heron, stork, crane
Proto-Brythonic	*krɨxɨð = heron
Middle Welsh (Kymraec)	crychyd, krechydd, crechydd = heron
Welsh (Cymraeg)	crychydd [ˈkrəχɨ̞ð / ˈkrəχɪð] = heron
Old Cornish	cherhit = heron
Middle Cornish (Cernewec)	cerhidh = heron
Cornish (Kernewek)	kerghydh = heron
Old Breton	corcid = heron
Middle Breton (Brezonec)	quercheiz, querch-eïz, querc’heiz, qarc’hleyz kerc’heiz = heron
Breton (Brezhoneg)	kercʼheiz [kɛrˈɣɛjs] = heron

Etymology: possibly from Proto-Indo-European *(s)kreik- / *(s)kreig- (to screech, creak), which is imitative in origin [source]. Words for heron in Galician & Spanish (garza) and Portuguese (garça), probably come from the Celtiberian root [source].

Words from the same PIE root may include reiger (heron) in Dutch, Reiher (heron) in German, häger (heron) in Swedish, heron and egret in English, and haikara (heron, stork) in Finnish [source].

Gaulish	crehyr = heron
Proto-Brythonic	*krexVr = heron
Middle Welsh (Kymraec)	crehyr, creir, cr(e)yr = heron
Welsh (Cymraeg)	crëyr [ˈkrɛ.ɨ̞r / kreː.ɪr] = heron
Middle Breton (Brezonec)	querhair = heron

Etymology: possibly from the Proto-Indo-European *(s)ḱrey- (to scream, screech) [source].

Proto-Celtic	*garanos = crane
Gaulish	garanus = crane
Proto-Brythonic	*garan = crane, heron
Middle Welsh (Kymraec)	caran, garan = crane, heron
Welsh (Cymraeg)	garan [ˈɡaran] = crane, heron
Old Cornish	garan = crane
Middle Cornish (Cernewec)	garan = crane
Cornish (Kernewek)	garan = crane
Old Breton (Brethonoc)	garan = crane
Middle Breton (Brezonec)	garan = crane
Breton (Brezhoneg)	garan [ˈɡɑː.rãn] = crane (bird, tool), groove, gallery garanadur = grooving garanan = to groove

Etymology: from Proto-Indo-European *gérh₂n-o-s, from *gerh₂- (crane, to cry hoarsely) [source]. Words from the same roots include crack, croon, crow and possibly grouse in English, kraai (crow) in Dutch, Krähe (crow) in German [source].

Sources: Wiktionary, Etymological Dictionary Of Proto Celtic, In Dúil Bélrai English – Old Irish glossary, eDIL – Electronic Dictionary of the Irish Language, Teanglann.ie, Am Faclair Beag, An etymological dictionary of the Gaelic language, Fockleyreen: Manx – English Dictionary, Online Manx Dictionary, Gaelg Corpus, Geiriadur Prifysgol Cymru, Lexicon cornu-britannicum : a dictionary of the ancient Celtic language of Cornwall, Gerlyver Kernewek, Devri : Le dictionaire diachronique du breton, Dictionaire Favereau, TermOfis

Oak (trees)

21st August 201923rd November 2024 By Simon

Words for oak (tree) and related things in Celtic languages.

Words marked with a * are reconstructions.

Proto-Celtic	*daru [d̪ˠaɾʲ] = oak
Gaulish	Dervo = used in placenames
Old Irish (Goídelc)	dair [d̪ˠaɾʲ] = oak
Middle Irish (Gaoidhealg)	dair, daur = an oak, the letter D in the Ogham alphabet (ᚇ) dairbre, dairbhre = an oak, oakling, a grove of oak grees, an oak wood dairde, daurde = oaken dair-ḟid, dauruth = an oak wood
Irish (Gaeilge)	dair [d̪ˠaɾʲ] = oak, the letter D in the Ogham alphabet (ᚇ) dairbhre = oaks, oak-grove daireach = planted with / full of oaks doire [ˈd̪ˠɛɾʲə] = oak-wood; wood, grove, thicket
Scottish Gaelic (Gàidhlig)	dair [darʲ] = oak (archaic), the letter D, ᚛ᚇ᚜ in Ogham dairbhre = oak, nursery or grove of oaks darach [darəx] = oak, oaken, made of oak; ship (poetic) darag [darag] = small/dwarf oak, stunted/branchy tree (which is not useable for working)
Manx (Gaelg)	darragh = oak, oaken, oak grove, oak wood darrag = oak, beam, cast (fishing), snood, hairline darree = oak
Proto-Brythonic	*dar [ˈdar] = oak tree
Middle Welsh (Kymraec)	dar, dâr = oak derwd(y) = oak house, oratory, prayer house, coffin derwin, deruin = make of oak, oaken, abounding in oaks, strong, robust, oak timber
Welsh (Cymraeg)	dâr [ˈdaːr] = oak tree, foremost warrior, leader, mighty lord derw = oak trees derwen [ˈdɛrwɛn] = oak tree derwin = make of oak, oaken, abounding in oaks, strong, robust, oak timber der(w)lwyn = oak grove, oak wood
Old Cornish	dar = oak
Middle Cornish (Cernewec)	dar = an oak
Cornish (Kernewek)	dar [daːr / dæːr] = oak derwen = oak tree derw = oak trees
Old Breton	daeru = oaks
Middle Breton (Brezonec)	deru = oaks
Breton (Brezhoneg)	dar [dɑːr] = oak derv [ˈdɛrw/ˈdɛː.ro] = oaks dervenneg = with oak trees dervoed [dɛʁwət] = oak grove, oak wood

Etymology: from the Proto-Indo-European *dóru (tree) [source].

Words from the same Proto-Celtic root possibly include làrix (larch) in Catalan, lariks (larch) in Dutch learag (larch) in Scottish Gaelic, larch in English, Lärche (larch) in German, and lærk (larch) in Danish [source].

Words from the same PIE root include δόρυ (dóry – spear) in Greek, dervà (tar, resin) in Lithuanian terva (tar) in Finnish, dearbh (sure, certain) in Irish, tree, trim, and trough, true in English, and trä (wood) in Swedish [source].

Proto-Celtic	*tannos = green oak
Gaulish	*tannos = oak
Old Irish (Goídelc)	tinne = holly, elder
Middle Irish (Gaoidhealg)	tinne = holly, elder, the letter t in the Ogham alphabet (ᚈ)
Irish (Gaeilge)	tinne = the letter t in the Ogham alphabet (ᚈ)
Scottish Gaelic (Gàidhlig)	teine/tinne [tʲenə] = gorse, whin, furze (archaic), the letter t (ᚈ) in Ogham
Welsh (Cymraeg)	taneru, tener(i)o = to tan (hide) tanerdy = tannery tanerwr = tanner (of hides)
Old Cornish	tannen = oak (?)
Middle Cornish (Cernewec)	tonnen = bark glastanen, glastennen, glastan = (scarlet) oak
Cornish (Kernewek)	glastanen gelyn = holly/holm oak glastanen gork = cork oak
Middle Breton (Brezonec)	glastann(enn) = holm oak(s)
Breton (Brezhoneg)	tann [tānː] = sessile oaks tannañ = to tan glastann = holm oaks

Note: the Welsh words were borrowed from English tanner, which ultimately comes from Proto-Celtic *tannos, via French, Latin and Gaulish.

Etymology: from Proto-Celtic *(s)tannos, the Proto-Indo-European *(s)dʰnwos/*(s)dʰonu (fir). Words from the same Proto-Celtic roots, via Gaulish and Latin tannum (oak bark), include tan (pulped oak bark used in the tanning process of leather) in French, tano (stem, slip) in Galician, tanería (tannery), Tannenbaum (fir tree, Christmas tree) in German, θάμνος (thámnos – bush) in Greek, and tan, tannery, tannin (tannic acid) in English.

Words from the same PIE roots include thanë (cranberry bush) in Albanian, and धनु (dhanu – bow) in Sanskrit. [source].

Doctor

8th April 20195th July 2025 By Simon

Words for doctor and related things in Celtic languages.

Words marked with a * are reconstructions.

Middle Irish (Gaoidhealg)	dochtúir, doctúir = learned ma, teacher, professor, physician
Irish (Gaeilge)	dochtúir [d̪ˠɔxˈt̪ˠuːɾʲ / ˈd̪ˠʌxt̪ˠuɾʲ] = doctor dochtúireacht = doctorate, medical practice, doctoring
Scottish Gaelic (Gàidhlig)	dotair [dɔhdɛrʲ] = doctor, surgeon, physician dotaireachd [dɔhdɪrʲəxg] = doctorate, knowledge of medicine, (act of) curing, healing dotaireas [dɔhdɪrʲəs] = doctorate, knowledge of medicine
Manx (Gaelg)	doghtoor = doctor doghtoorahgt = doctorate
Middle Welsh (Kymraec)	doethur = doctor, teacher, sage, learned man
Welsh (Cymraeg)	doethur, doethor = doctor, teacher, sage, learned man
Cornish (Kernewek)	doktour = doctor

Etymology: from the Latin doctor (teacher, instructor), from doceō (teach), from the Proto-Italic *dokeō (tell, inform, teach, instruct), from the Proto-Indo-European *deḱ- (to take) [source].

Proto-Celtic	*lī(φ)agi- = doctor
Old Irish (Goídelc)	líaig = leech, doctor, physician fáithlíaig = doctor, physician leiges = healing, medicine, curing
Middle Irish (Gaoidhealg)	líaig, liag, leaga, lega, lieig = leech, doctor, physician, adviser, healer leiges. leges, leighis = healing, medical treatment, cure, remedey, medicine, medicament, curing, healing leigesamail = medicinal, healing leigisid, leigiste = medicinal, healing, to cure, to heal
Irish (Gaeilge)	lia [l̠ʲiə] = healer, physician lia ban = gynaecologist lia súl = oculist leigheas = art of healing, medicine, medical treatment leigheasach = healing, curative, medicinal leigheasóir = healer, curer leigheasra = cures, medicines
Scottish Gaelic (Gàidhlig)	lèigh [l̪ʲeː] = physician, surgeon lèighadair = pharmacist lèigheadairachd = pharmacy lèigheadh = (act of) healing leigheas [l̪ʲe.əs] = curing, healing, medicine lèigheil = medical lighiche [l̪ʲi.ɪçə] = healer, physician, surgeon
Manx (Gaelg)	(fer/ben) lhee = (male/female) doctor, physician lheihys = cure, curing, heal(ing), remedy lheihyssagh = curable, curative, healing

Etymology: possibly from Proto-Germaic *lēkiz (healing, medicine, healer), or directly from the Proto-Indo-European *h₂leg- (to care for) [source]. Words from the same Proto-Celtic / PIE root possibly include leech in English, læknir (medical practitioner, doctor) in Icelandic, läkare (doctor, physician) and läka (to heal) in Swedish, lääkäri (phyisican, doctor) in Finnish, and læge (doctor, physician, surgeon) in Danish [source].

Old Irish (Goídelc)	midach = physician
Middle Irish (Gaoidhealg)	midach, midech, midaig = physician
Proto-Brythonic	*meðïg = doctor
Middle Welsh (Kymraec)	metic, medyc, med(d)ic, meddig = doctor, medical practitioner, physician, surgeon, healer methygaeth = (science of) medicine, surgery, drug medyges, meddyges female doctor or healer, female herbalist medegynyaeth, medeginyaeth, medegynyaeth = medicine, remedy, medical treatment, surgery, cure, healing
Welsh (Cymraeg)	meddyg [ˈmɛðɪɡ / ˈmeːðɪɡ] = doctor, medical practitioner, physician, surgeon, healer meddyg(i)adwy = curable, treatable meddyg(i)aeth = (science of) medicine, surgery, drug meddygu = to practise medicine, to treat medically, to prescribe, to heal, to cure meddyges female doctor or healer, female herbalist meddygfa = surgery, clinic, pharmacy, hospital meddygin(i)aeth = medicine, remedy, medical treatment, surgery, cure, healing meddygol = medical, medicinal, healing, curative
Old Cornish	medhec = physician
Middle Cornish (Cernewec)	methic, medhic = physician
Cornish (Kernewek)	medhek [mɛðɛk / ‘mɛðɐk] = doctor, physician medhegel = medical medhegieth = medical science, medicine medhegiethel = medicinal medhegneth = medication, medicine medhegva = clinic, (doctor’s) surgery medhegvael = clinical
Middle Breton (Brezonec)	mezec = doctor mezeyaff = to treat, to care for mezeyet, mezeguet = medicine mezegioez = medicine
Breton (Brezhoneg)	mezeg [ˈmeː(z)ek] = doctor mezegañ [meˈ(z)eː.ɡã] = to care for (medically), to treat mezegiezh [me(z)eˈɡiːɛs] = medicine

Etymology: from the Latin medicus (doctor), from medeor (I heal, cure, remedy), from the Proto-Italic *medēōr (to heal), from Proto-Indo-European *med- (to measure, give advice, heal). Words from the same roots include medico (doctor, physician, medical) in Italian, medicus (doctor, physician) in Dutch, medic, medical, medicine, meditate and remedy in English, and médico (doctor, physician) in Spanish [source].

Shoulders

29th November 20189th March 2026 By Simon

Words for shoulder and related things in Celtic languages.

Words marked with a * are reconstructions.

Old Irish (Goídelc)	gúala = shoulder
Middle Irish	gúala, gualann, gūaluinn = shoulder gúaillech = shouldered, branched, branching gúaillid = companion, comrade gúalaire = load, burden
Irish (Gaeilge)	gualainn [ˈɡuˑəl̪ˠənʲ] = shoulder guailleadóireacht = (act of) shouldering, swaggering guailleáil = to shoulder, to jostle with shoulder, to lurch with shoulders, to saunter, to swagger guailleálaí = shoulderer, lurcher, saunterer, swaggerer guailleán = shoulder-strap, braces guailleog = epaulet(te) guaillí = companion guaillíocht = companionship
Scottish Gaelic (Gàidhlig)	guaille [guəl̪ˠə] = shoulder guailleach [guəl̪ˠəx] = pertaining to shoulders guailleachan / guailleag [guəl̪ʲəxan / guəl̪ʲag] = shoulder-mantle, shawl gualann [guəl̪ˠən̪ˠ] = shoulder, corner of a house, tack (nautical), brow (geography), shoulder (of mutton), shaft (of a cart), curve of a (ship’s) bow
Manx (Gaelg)	geaylin = shoulder, corner (of house) geayliney = shoulder geaylinagh = shouldered geaylaig = epaulette

Etymology: from Proto-Indo-European *gew- (to bend, curve, arch, vault) [source]. Words from the same roots include cuttlefish, gown, kidney, chitterling and gyration in English, Kuhle (hollow, depression) in German, kiel (keel) in Dutch, gonna (skirt) in Italian, and keula (bow, prow) in Finnish [source].

Proto-Celtic	*skēdos = wing, shoulder
Old Irish (Goídelc)	scíath = wing
Middle Irish	scíath = wing scíathán, sgíthéan, sgiathán = wing scíathánach = winged
Irish (Gaeilge)	sciathán [sˠciəˈhɑ̃ːn̪ˠ] = wing, side, extension, part, piece, arm sciathánach = winged, long-armed An tOileán Sciathánach = Isle of Skye
Scottish Gaelic (Gàidhlig)	sgiath [sgʲiə] =wing, fin sgiathan [sgʲiahan] = small wing sgiathach [sgʲiəhəx] = pertaining to shoulders sgiathadaich [sgʲiəhədɪç] = fluttering sgiathadh [sgʲiəhəɣ] = (act of) flying sgiathag [sgʲiəhag] = little wing sgiathaire [sgʲiə.ɪrʲə] = winger (in sports) An t-Eilean Sgitheanach = Isle of Skye
Manx (Gaelg)	skian [skʲiən] = wing, pinion, mudguard, baffle skianagh = winged, finned, pinioned, winged creature Ellan Skianagh = Isle of Skye
Proto-Brythonic	*skuïð = shoulder
Old Welsh (Kembraec)	iscuid = shoulder
Middle Welsh (Kymraec)	ysgwyt, ysgwyd, ysgỽyd = shoulder ysgwydawc, yscwyddoc, ysgwyddoc = shoulder(-blade), (upper part of) arm, shoulder (meat), having shoulders
Welsh (Cymraeg)	ysgwydd [ˈəsɡwɨ̞ð / ˈəsɡʊi̯ð] = shoulder ysgwyddo = to shoulder, push with the shoulder(s), hustle, jostle, support, shrug ysgwyddiad = standing out, jutting out, projection, protusion, cornice ysgwyddog = shoulder(-blade), (upper part of) arm, shoulder (meat), having shoulders ysgwyddol = scapular, like a shoulder in shape
Old Cornish	scuid =shoulder
Middle Cornish (Cernewec / Kernuak)	scuid, scudh, scoudh, scôdh, scûdh = shoulder scuidlien = a hood
Cornish (Kernewek)	skoodh [sko:ð / sku:ð] = shoulder skoodhya = to assist, back, help, second, support skoodhyans = assistance, help, support skoodhyer = assistant, exponent, fan, supporter
Middle Breton (Brezonec)	scoaz = shoulder
Breton (Brezhoneg)	skoaz [ˈskwɑː(s)] = shoulder, help skoazek = (person) with broad shoulders, killer whale skoazell [ˈskwɑː.(z)ɛl] = help, assistance skoazellañ [skwa.ˈ(z)ɛ.lːã] = to help, to rescue, to subsidize skoazeller = assistant, helper, auxiliary skoaziañ [ˈskwa(z)jã] = to support, to help, to assist

Etymology: unkown, possibly from Proto-Indo-European *skeyd- (to split, divide) [source].

Thick

23rd October 201813th July 2025 By Simon

Words for thick and related things in Celtic languages.

Words marked with a * are reconstructions.

Proto-Celtic	*tegus = thick
Old Irish (Goídelc)	tiug [tʲiu̯ɣ] = thick, dense tiget = thickness
Middle Irish (Gaoidhealg)	tiug = thick, dense, solid, density, press, crowd tiugaigid = to thicken
Irish (Gaeilge)	tiú = thick, dense tiubh [tʲuː / tʲʊ(w)] = thick, dense, closely set; fast tiubhaigh = to thicken, conventrate tiúchan = concentration
Scottish Gaelic (Gàidhlig)	tiugh [tʲu] = thick; stout, portly, buxom; fat, viscous (paint); frequent strong>tiughachadh [tʲu.əxəɣ] = (act of) thickening, squeezing strong>tiughad(as) [tʲu.əd(əs)] = thickness strong>tiughaich [tʲu.ɪç] = thicken, squeeze strong>tiughalach [tʲu.əl̪ˠəx] = dregs
Manx (Gaelg)	chiu = stout, thick, heavy, blubber, thick-set ( hedge), strong (solution), whipped (cream), intense; foggy, turbid cheeid = thickness, density, grossness chiughey = to become heavy, to clot, to concentrate, to congeal, to thicken
Proto-Brythonic	*teɣ = thick
Old Welsh	teu = thick
Middle Welsh (Kymraec)	tew, teỽ, tev = thick, strong, sturdy, deep teỽder, tewder thickness, depth, density, fatness tewet, tewhet, teỽet = thickness, depth, fat tewhau, tevhau = to make or become fat, to fatten, to thicken, to congeal
Welsh (Cymraeg)	tew [teːu̯ / tɛu̯] = thick; made of thick cloth; strong, sturdy, powerful; deep tewder thickness, depth, density, fatness, corpulence, obesity, hardness (of hearing) tewed = thickness, depth, fat tewhad = fattening, thickening, coagulation, condensation tewhau = to make or become fat, to fatten, to thicken, to congeal
Middle Cornish (Cernewec)	tew = thick, gross, fat, foggy tewder = thickness, grossness, fatness tewraga = to thicken
Cornish (Kernewek)	tew [tɛˑʊ] = fat, bulky, dense, thick, chubby tewder = bulk, consistency, density, thickness tewhe = to thicken, fatten
Middle Breton	teu, teo = thick, fat, big teuhat = to thicken, grow teuder, teoder = thickness, size
Breton (Brezhoneg)	tev [ˈtew] = thick, fat, big, obese, opaque tevaat {teˈvɑːt] = to thicken, grow tevded [ˈtew.det] = thickness, size tevder [ˈtew.dɛr] = thickness, size tevdur = thickening, enlargment, coagulation

Etymology: from Proto-Indo-European *tégus (thick), from *teg- (to cover) [source]. Words from the same roots include thick, protect, thatch, thug and tile in English, dik (thick, fat, cool, nice) in Dutch, dick (thick, fat) in German, tjock (thick, fat) in Swedish, tykky (thick snow or rime on trees) in Finnish, and deahkki (muscle) in Northern Sami [source].

Proto-Celtic	*remros = fat, thick
Old Irish (Goídelc)	remor [ˈr͈ʲeβ̃or] = fat, stout, thick
Middle Irish (Gaoidhealg)	remor, reamur, remar = stout, thick, bulky, corpulent remraigid = to thicken, fatten, make stout
Irish (Gaeilge)	ramhar [ɾˠauɾˠ / ˈɾˠãuəɾˠ] = fat, thick ramharaigh = to fatten, thicken, batter, stupefy ramharú = fattening, coagulation, fulling, dulling stupefying, beating
Scottish Gaelic (Gàidhlig)	reamhar [r̪ˠãũ.ər] = fat, plump, meaty, fleshy reamhrachd [r̪ˠɛ͂ũrəxg] = fatness, state of being overweight ro-reamhar = obese
Manx (Gaelg)	roauyr = fat, thick, stout, gross, bulky, plump, overweight roauyragh = fattening, fatness, fat person roauyraghey = to fatten, to thicken, to gain weight, fattening, thickening roauyrey = fat
Proto-Brythonic	*rreβ̃ = (?)
Middle Welsh (Kymraec)	ref = thick, stout, great, large
Welsh (Cymraeg)	rhef = thick, stout, great, large, bundle rhefder = thickness, stoutness, girth

Etymology: unknown [source].

Bad

5th October 20183rd November 2023 By Simon

Words for bad and related things in Celtic languages.

Good

Words marked with a * are reconstructions.

Proto-Celtic	*drukos = bad
Gaulish	druco- = bad
Old Irish (Goídelc)	droch [drox] = bad, ill
Middle Irish (Gaoidhealg)	droch = bad
Irish (Gaeilge)	droch [drɔx] = bad, poor, evil, ill, un- drochbhéas = vice, bad habit drochmheas = contempt drochobair = bad work, mischief drochrath = ill luck, misfortune drochrud = bad thing, inferior thing, bad/evil person, devil drochrún = evil intention drochuair = evil hour, unfortunate occasion
Scottish Gaelic (Gàidhlig)	droch [drɔx] = bad, evil, wicked, mischievous, sad, calamitous, dark, obscure, secretive droch-aigne = ill-will droch-allaidh = libel droch-chòrdadh = disagreement droch-fhàistinneach = ominous droch-mhèin = malice droch-thuarach = sinister
Manx (Gaelg)	drogh [drɔx] = evil, wicked, bad, abusive, unenviable, misfortune, badness, ill, sinister, vile drogh aghtalys = misbehaviour, misconduct drogh chaaynt = bad language, smut, swearing drogh chonagh = misfortune drogh hraghtey = to smuggle, smuggling drogh oor = bad luck, ill-times, misfortune
Proto-Brythonic	*drug = bad
Middle Welsh (Kymraec)	druc, dryg, drỽc, drwc = bad drycaruer , drygarver, drycarver = bad habit, abuse, misuse drygdafod = scurrilous language, evil tongue
Welsh (Cymraeg)	drwg [druːɡ] = bad, rotten, putrid; poor, piteous, wretched; sorry, grievous, sad; unfavourable, causing disquiet; injurious, harmful; unpleasant (taste); indecent, obscene (words); counterfeit, false; bad; harsh, cruel, severe, ruthless; corrupt, depraved, sinful, wicked, mischievous, naughty strong>drwgabsen = malicious defamation, slander drwgafer = bad habit, abuse, misuse drwgdafod = scurrilous language, evil tongue drwgenwog = infamous, notorious, disreputable
Middle Cornish (Cernewec)	droc, drôg, drog = evil, wickedness, harm, injury, wrong, bad, wicked, hurtful, mischievous droca, droga = worst drocoleth = an evil deed, ill doing, injury, damage droga, droaga = to do harm, hurt, injure drogbrederys = evil-minded, malicious, envious drogbres = ill will, spite, grudge drogdavasec = ill-tongued, foul-mouthed, back-biting, reviling drogger = ill report, infamy, reproach droggeriit = infamous, reproachful droggras = revenge, requital drogober, drôk-ober = an evil deed, a crime
Cornish (Kernewek)	drog [drɔ:g / dro:g] = bad, harm, hurt, ill, wrong, evil, invalid, nasty, naughty, wicked, wrong drogdybi = to suspect drogedh = vice drogfara = to behave badly drogga = wrong droghandla = to abuse, mishandle droglam = accident, crash, mishap drogober = crime drogboeror, drogoberores criminal, culprit drogura = to smear drokoleth = widkedness drokter = wickedness
Middle Breton (Brezoneg)	drouc = bad, illness, anger drouc Ælez = the devil, bad angel drouc auantur = misfortune, bad luck droucyez, drouguyez = wickedness, malice, animosity drouc = drouc =
Breton (Brezhoneg)	drouk [druːk] = bad, evil, naughty droug [druːk] = bad, wickedness drougiezh [druˈɡiːɛs] = wickedness, malice, animosity droukrañsus [druˈɡrãsːys] = angry, resentful droukaat = to become bad, make bad drouziwezh [dru.ˈziː.wɛs] = defeat, disaster dizrouk [ˈdi.zruk] = inoffensive, without anger

Etymology: possibly from the Proto-Indo-European *dʰrewgʰ- (to deceive) [source]. Word from the same roots include dream in English, droom (dream) and driegen (to deceive) in Dutch, Traum (dream) and trügen (to deceive, be deceptive) in German [source].

Proto-Celtic	*dognawos = badly grown (?)
Old Irish (Goídelc)	dona [ˈdona] = unlucky, unfortunate
Middle Irish (Gaoidhealg)	dona = unfortunate, unlucky, wretched donaide = ill-disposed, wretched donán = miserable creature, wretch donas = ill-luck, misfortune, calamity donogad = act of making wretched
Irish (Gaeilge)	dona [ˈd̪ˠɔn̪ˠə/ˈd̪ˠʌnˠə] = unfortunate, unlucky, bad, poor, wretched, ill donacht = badness, wretchedmess, misfortune, illness donagar = bad condition, misfortune donaigh = to make worse, aggravate, become word, deteriorate, injure, maim donaire = wretch donaireacht = wretchedness donaisín = little wretch, weakling donas = ill-luck, misfortune, affliction, misery, mischief
Scottish Gaelic (Gàidhlig)	dona [dɔnə] = bad, not well donachas [dɔnəxəs] = mischief, harm, bad luck, mishap, devil donachd [dɔnəxg] = mischief, harm, bad luck, mishap donad [dɔnəd] = degree of badness, severity donadas [dɔnədəs] = badness, evil donas [dɔnəs] = mischief, harm, bad luck, devil donasag [dɔnəsag] = imp
Manx (Gaelg)	donney [ɔlk] = calamitous, ill-advised, inauspicious, unfortunate, unlucky, very ill, woeful, unhappy donnan = dolt, dunce, stupid person, worse donnys = affliction, bad luck, mischief, woe

Etymology: possibly from the Proto-Indo-European *ǵneh₃- (to recognise, know) [source]. Words from the same root include can, canny, gnome, ignore, know and quaint in English [source].

Proto-Celtic	*ulkos = evil, bad
Old Irish (Goídelc)	olc [olk] = bad, evil olcas = badness
Middle Irish (Gaoidhealg)	olc, olcc = evil, bad, wrong, misfortune olcach = hurtful, injurious, harm, injury olcas = badness
Irish (Gaeilge)	olc [ɔl̪ˠk] = evil, harm, bad, harmful, poor, wretched, ill-disposed, hardly, scarcely olcach = causing evil, harmful, injurious. olcas = badness, evil, bad state, bad nature, spite
Scottish Gaelic (Gàidhlig)	olc [ɔl̪ˠxg] = evil, wicked, bad, infamous, ill, iniquity olcag [ɔl̪ˠxgag] = little brat (female) olcair [ɔl̪ˠxgɛrʲ] = evildoer olcas [ɔl̪ˠxgəs] = wickedness, badness
Manx (Gaelg)	olk [ɔlk] = bad, evil, ill, injury, lousy, truculence, unfavourable, vicious, wicked, mischief, naughty, sinful olkeyr = criminal, culprit, evil-doer, offender, mischief-maker olkid = badness, evilness olkys = badness, evilness, iniquity, mischief olkyssagh = baleful, elfish, diabolical, iniquitous, malicious, malignant, mischievous, naughty, vicious, wicked

Etymology: from the Proto-Indo-European *h₁elḱ- (bad [?]) [source]. Words from the same root include ill and possibly ulcer in English, illa (badly, poorly, not well) in Swedish, and ilkeä (bad, mean, wicked, evil) in Finnish [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Lexicon Cornu-britannicum: A Dictionary of the Ancient Celtic Language of Cornwall, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Etymological Dictionary Of Proto Celtic

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