Etymology
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aghast (adj.)

c. 1300, agast, "terrified, suddenly filled with frightened amazement," past participle of Middle English agasten "to frighten" (c. 1200), from a- intensive prefix (see a- (1)) + Old English gæstan "to terrify," from gæst "spirit, ghost" (see ghost (n.)). The unetymological -gh- is perhaps a Flemish influence, or after ghost, etc., and became general after 1700.

updated on September 15, 2022

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Definitions of aghast from WordNet

aghast (adj.)
struck with fear, dread, or consternation;
Synonyms: appalled / dismayed / shocked
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.