clueless /ˈkluːləs/ adjective Learner's definition of CLUELESS
[more clueless; most clueless] informal
: not having knowledge about something : unable to understand something一无所知的;一窍不通的 -
When it comes to computers, I'm clueless.说到电脑,我是一窍不通。
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her clueless kid brother她什么都不懂的小弟弟
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They were clueless about what to do.他们对要做什么一无所知。