/ Dictionary / Index I incestuous: Meaning and Definition of Find definitions for: in•ces•tu•ous Pronunciation: (in-ses'ch-us), [key] — adj. involving incest. guilty of incest. being so close or intimate as to prevent proper functioning: an incestuous relationship between organized crime and government. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: incestuous (Thesaurus) incest inch Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language