01 a. Guilty of incest; involving, or pertaining to, incest; as, an incestuous person or connection.
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1.
Guilty of incest; involving, or pertaining to, incest; as, an incestuous person or connection.“Ere you reach to this incestuous love, You must divine and human rights remove.” — Dryden.
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2.
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.