incesttuous

CIDE DICTIONARY

incesttuous, a. [L. incestuosus: cf. F. incestueux.].

Guilty of incest; involving, or pertaining to, incest; as, an incestuous person or connection. Shak. [1913 Webster]
"Ere you reach to this incestuous love,
You must divine and human rights remove."
resembling incest; between people or groups so closely related as to make such activity improper or unethical; as, an incestuous coziness between the management of the company and its union; an incestuous relationship between the salesman and the purchasing manager. [PJC]

For further exploring for "incesttuous" in Webster Dictionary Online

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