名词
中文翻译：Unknown
同义词：
['disloyal', 'unfaithful', 'treacherous', 'deceitful']
例句：
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1.The couple's infidelity has caused irreparable damage to their relationship.
这对夫妇的不忠已经对他们的关系造成了无法修复的伤害。
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2. He was accused of being unfaithful and having an affair with his secretary.
他被指控不忠，与他的秘书有染。
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3.The company's treacherous behavior has tarnished its reputation.
这家公司的不诚实行为已经玷污了它的声誉。