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incestuous

Incestuous describes an overly close relationship that seems improper, or inappropriate sexual behavior between family members. (adjective)

  1. When two people who grew up together and who were always overly close begin a love affair that seems inappropriate, this is an example of anincestuous relationship.
  2. When two siblings have a sexual relationship, this is an example of anincestuous relationship.

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See incestuous in Webster's New World College Dictionary

See incestuous in American Heritage Dictionary 4

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