/ Dictionary / Index A appalling: Meaning and Definition of Find definitions for: ap•pall•ing Pronunciation: (u-pô'ling), [key] — adj. causing dismay or horror: an appalling accident; an appalling lack of manners. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: appalling (Thesaurus) appall Appaloosa 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