unfaithfulness
US /ʌnˈfeɪθ.fəl.nəs/
UK /ʌnˈfeɪθ.fəl.nəs/
名詞
不貞
the fact of having a sexual relationship or experience with a person who is not your husband, wife, or usual sexual partner:
例:
•
His sister accused their father of adultery and unfaithfulness.