/ Dictionary / Index A appall: Meaning and Definition of Find definitions for: ap•pall Pronunciation: (u-pôl'), [key] — v.t. to fill or overcome with horror, consternation, or fear; dismay: He was appalled by the damage from the fire. I am appalled at your mistakes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: appall (Thesaurus) Appalachian trail appalling Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language