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新东方-柯林斯雅思备考词典
unfaithful
英 [ˌʌnˈfeɪθfʊl]
[ADJ]
1. （对恋人或配偶）不忠诚的
If someone is unfaithful to their lover or to the person they are married to, they have a sexual relationship with someone else.
双语例句
例：James had been unfaithful to Christine for the entire four years they'd been together.
与克里斯蒂娜一起的整整4年里，詹姆斯一直对她不忠。