副词
中文翻译：无防备地
同义词：
['unprotectedly', 'unpreparedly', 'unsuspectingly']
例句：
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1. He walked into the room without any warning, unguardedly.
他毫无预警地走进了房间。
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2. The thief was caught unguardedly by the police.
这个小偷被警察毫无防备地抓住了。
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3. The children were playing unguardedly in the park.
孩子们在公园里毫无防备地玩耍。