unfaithful
[ʌnˈfeθfəl]
adj.
不忠实的;
不正直的;
（翻译等）不可靠的;
不贞洁的;
例句:
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He vowed to wreak vengeance on his unfaithful, thieving wife.
他发誓要报复对自己不忠、爱偷东西的妻子。
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Have you ever been unfaithful to him?
你对他是否有过不忠行为？
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Have you ever been unfaithful to your wife?
你曾对妻子不忠 吗 ?
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Now the unfaithful are given away by their mobile phones.
来自THETIMES
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I was unfaithful, I had affairs and I cheated.
来自BBC
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With quiet eyes unfaithful to the truth.
来自Tennyson