/ Dictionary / Index G gainsay: Meaning and Definition of Find definitions for: gain•say Pronunciation: (gān'sā", gān-sā'), [key] — -said, -say•ing. to deny, dispute, or contradict. to speak or act against; oppose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gainsay (Thesaurus) gainly Gainsborough Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language