• synonyms


[in-ses-choo-uh s]
See more synonyms for incestuous on Thesaurus.com
  1. involving incest.
  2. guilty of incest.
  3. being so close or intimate as to prevent proper functioning: an incestuous relationship between organized crime and government.
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Origin of incestuous

1525–35; < Late Latin incestuōsus, equivalent to Latin incestu- stem of incestus incest + -ōsus -ous
Related formsin·ces·tu·ous·ly, adverbin·ces·tu·ous·ness, nounnon·in·ces·tu·ous, adjectivenon·in·ces·tu·ous·ly, adverbnon·in·ces·tu·ous·ness, nounun·in·ces·tu·ous, adjectiveun·in·ces·tu·ous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for incestuous

carnal, depraved, lewd, interbred

Examples from the Web for incestuous

Historical Examples of incestuous

  • Incestuous relationships are by no means uncommon among the Mo.

    Indo-China and Its Primitive People

    Henry Baudesson

  • Incestuous adultery is adultery with a woman within the prohibited degrees.

British Dictionary definitions for incestuous


  1. relating to or involving incestan incestuous union
  2. guilty of incest
  3. obsolete resulting from incestan incestuous bastard
  4. resembling incest in excessive or claustrophobic intimacy
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Derived Formsincestuously, adverbincestuousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for incestuous


1530s, from Latin incestuosus "incestuous," from incestus "unchaste" (see incest). Figurative use is from 1744. Related: Incestuously; incestuousness.

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Online Etymology Dictionary, © 2010 Douglas Harper

incestuous in Medicine


  1. Of, involving, or suggestive of incest.
  2. Having committed incest.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.