1. (

• adulterous ,
• extramarital ,
• extracurricular

) characterized by adultery; "an adulterous relationship"; "extramarital affairs"; "the extracurricular activities of a philandering husband" ;

2. (

• adulterous ,
• cheating ,
• two-timing

) not faithful to a spouse or lover; "adulterous husbands and wives"; "a two-timing boyfriend" ;