Synonyms: two-timing, adulterous, cheating
Definition: not faithful to a spouse or lover
Usage: adulterous husbands and wives; a two-timing boyfriend
Similar words: unfaithful
Definition: having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
Usage: her husband was unfaithful
Synonyms: adulterous, extracurricular, extramarital
Definition: characterized by adultery
Usage: an adulterous relationship; extramarital affairs; the extracurricular activities of a philandering husband
Similar words: illicit
Definition: contrary to accepted morality (especially sexual morality) or convention
Usage: an illicit association with his secretary