/ Dictionary / Index F flabbergast: Meaning and Definition of Find definitions for: flab•ber•gast Pronunciation: (flab'ur-gast"), [key] — v.t. to overcome with surprise and bewilderment; astound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: flabbergast (Thesaurus) flab flabby Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language