mid-14c., "acting falsely," from un- (1) "not" + faithful. In Middle English it also had a sense of "infidel, unbelieving, irreligious" (late 14c.). Sense of "not faithful in marriage" is attested from 1828. Related: Unfaithfully; unfaithfulness.
雙語例句
1. He vowed to wreak vengeance on his unfaithful, thieving wife.
他發誓要報復對自己不忠、愛偷東西的妻子。
來自柯林斯例句
2. Have you ever been unfaithful to him?
你對他是否有過不忠行為？
來自《權威詞典》
3. Have you ever been unfaithful to your wife?
你曾對妻子不忠 嗎 ?
來自《簡明英漢詞典》
4. She wondered if Harry had been unfaithful to her during this long separation.
她不知道和哈里分開這么久，他是否曾對她不忠。
來自柯林斯例句
5. James had been unfaithful to Christine for the entire four years they'd been together.