unfaithful

/ʌnfˈe‍ɪθfə‍l/

/ənˈfeɪθfəɫ/

unfaithful

having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend

antonyms : faithful

not true to duty or obligation or promises

antonyms : faithful

having the character of, or characteristic of, a traitor

synonyms : faithless

not trustworthy

Examples

1. When Amanda discovered that Jack was unfaithful, she sent him packing.

2. Your wife is unfaithful?

3. - Were you unfaithful?

4. - You're unfaithful.