Etymology
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incestuous (adj.)

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

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Definitions of incestuous

incestuous (adj.)
resembling incest as by excessive intimacy;
incestuous (adj.)
relating to or involving incest;
From wordnet.princeton.edu