Is a flabbergast a gast that’s flabbered? Let’s find out.
A flabbergast is an awkward person, or an overwhelming confusion, shock or surprise, and to flabbergast is to overwhelm with bewilderment, or to amaze, confound, or stun, especially in a ludicrous manner.
Related words include
- flabbergastion = bewildered shock or surprise; the state or condition of being flabbergasted
- flabbergaster = a person, thing, fact or event that is flabbergasting, or that causes extreme shock; a state of surprise or fear
- flabbergastly = surprisingly, astonishingly or amazingly
Flabbergast possibly comes from the Suffolk dialect words flap(py) (to strike) and aghast (terrified), or from Scots flabrigast (to swagger, boast, quite worn out, extremely fatigued). There are also versions of this word from Lancashire: flobbergrast and Northampton: flappergast [source].
Aghast means terrified; struck with amazement, or showing signs of terror or horror. It comes from Middle English agast, from agasten (to frighten or terrify), from Old English gǣstan (to frighten, gast, torment, afflict), from Proto-West Germanic *gaistijan, from Proto-Germanic *gaistijaną, which is related to *gaistaz (fear, terror, spirit, ghost, mind) [source].
Related words include ghost, ghast (an evil spirit or monster) and ghastly in English, gast (ghost) in Swedish, geest (ghost, spirit, mind) in Dutch, and Geist (spirit, essense, mind, ghost) in German [source].
Incidentally, gast is an old word in English meaning to frighten, and also comes from the same roots [source], as does the Old English word gāst (spirit, ghost, breath, demon), which became gost / gast / gaast / goost / goste in Middle English [source]. It acquired an h and became ghoost in the late 15th century due to influence from the Flemish word gheest, possibly thanks to Wynkyn de Worde, William Caxton‘s assistant [source].
