unfaithful
🇺🇸
/ʌnˈfeɪθfl/
🇬🇧
/ʌnˈfeɪθfl/
adjective
R
not loyal or true to a spouse or partner, especially in marriage
He was unfaithful to his wife and had a secret relationship with another woman.
他對妻子不忠，與另一個女人有秘密關係。
translation
不忠的