adulterous has definitions from the field of sexuality
1
[ adjective ] (sexuality) characterized by adultery

Examples

"an adulterous relationship" "extramarital affairs" "the extracurricular activities of a philandering husband"

Related terms

illicit

2
[ adjective ] not faithful to a spouse or lover

Synonyms

two-timing cheating

Examples

"adulterous husbands and wives" "a two-timing boyfriend"

Related terms

unfaithful

3
[ adjective ] (sexuality) not faithful to a spouse or lover

Synonyms

two-timing cheating

Examples

"adulterous husbands and wives" "a two-timing boyfriend"

Related terms

unfaithful unfaithful

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