形容词
中文翻译：没有诚意的
同义词：
['untrustworthy', 'dishonest', 'unfaithful']
例句：
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1. He always acts with such a lack of sincerity that it's hard to believe him.
他的行为总是如此缺乏诚意，让人难以相信。
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2. The company's reputation suffered greatly due to their lack of sincerity in dealing withcustomers.
由于公司对客户的处理缺乏诚意，他们的声誉受到了严重损害。
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3.She was disappointed when she found out that the person she trusted so much had been acting with no sincerity.
当她发现她所信任的人完全没有诚意时，她感到非常失望。