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adulterous (adj.)

c. 1600, a classical correction (replacing earlier avoutrious "addicted to adultery," c. 1400), from obsolete verb adulter (see adulterer) + -ous. Related: Adulterously. Adulterine (1640s, from Latin adulterinus) was used in the sense "pertaining to adultery, born of adultery."

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Definitions of adulterous from WordNet

adulterous (adj.)
not faithful to a spouse or lover;
adulterous husbands and wives
Synonyms: cheating / two-timing
adulterous (adj.)
characterized by adultery;
an adulterous relationship
Synonyms: extramarital / extracurricular
From wordnet.princeton.edu