形容词
中文翻译：不忠的
同义词：
['untrustworthy', 'untrue', 'disloyal']
例句：
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1. He is known for his unfaithfulness to his wife.
他因对妻子不忠而闻名。
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2. The couple's relationship was damaged by her unfaithfulness.
夫妻关系因她的不忠而受损。
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3. The truth was not what he believed;he was unfaithful in his trust.
事实与他的信念不符，他在信任上是不忠实的。