/ Dictionary / Index I incredulous: Meaning and Definition of Find definitions for: in•cred•u•lous Pronunciation: (in-krej'u-lus), [key] — adj. not credulous; disinclined or indisposed to believe; skeptical. indicating or showing unbelief: an incredulous smile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: incredulous (Thesaurus) incredulity increment Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language