adulterous

Adjective
  1. Characterized by adultery (synset 301555136)
    "an adulterous relationship"; "extramarital affairs"; "the extracurricular activities of a philandering husband"
    similar to: illicit - contrary to accepted morality (especially sexual morality) or convention
    same as: extracurricular, extramarital
  2. Not faithful to a spouse or lover (synset 300964384)
    "adulterous husbands and wives"; "a two-timing boyfriend"
    similar to: unfaithful - having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
    same as: cheating, two-timing

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