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English definition of “be not all there”

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be not all there

informal
to be slightly stupid or strange
Translations of “be not all there”
in Chinese (Traditional) 有點愚蠢,缺心眼兒, 腦筋不大正常…
in Chinese (Simplified) 有点愚蠢,缺心眼儿, 脑筋不大正常…
(Definition of be not all there from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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