/ Dictionary / Index I incredible: Meaning and Definition of Find definitions for: in•cred•i•ble Pronunciation: (in-kred'u-bul), [key] — adj. so extraordinary as to seem impossible: incredible speed. not credible; hard to believe; unbelievable: The plot of the book is incredible. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: incredible (Thesaurus) increate incredulity 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