Open English Wordnet
Adjectives
(s)adulterous, extramarital, extracurricularcharacterized by adultery“an adulterous relationship”, “extramarital affairs”, “the extracurricular activities of a philandering husband”
(s)adulterous, cheating, two-timingnot faithful to a spouse or lover“adulterous husbands and wives”, “a two-timing boyfriend”