unfaithful
/ʌnˈfeɪθfl अन्ˈफे़थ़्फ़्ल्/ adj. unfaithful (to somebody/something) having a sexual relationship with somebody who is not your husband, wife or partner पति-पत्नी के संबंध में निष्ठारहित; बेवफ़ा
✪ विलोम faithful