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.


  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

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


  1. Of, involving, or suggestive of incest.
  2. Having committed incest.

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