名词
中文翻译：不正式的
同义词：
['informal', 'casual', 'non-serious', 'unserious']
例句：
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1. She always wears her favorite outfit, even when she's not in a formal setting.
她总是穿着她最喜欢的衣服，即使不是在正式场合。
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2. He's very informal with his colleagues and often talks about sports during work hours.
他对同事非常随和，经常在工作时间谈论体育。
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3. The casual dress code at the party made it easy for everyone to mingle without feeling formal.
派对上的休闲着装让每个人都能轻松交流，没有感到正式。