mentally defective Meaning in Cambridge English Dictionary
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Meaning of "mentally defective" - English Dictionary

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mentally defectiveadjective

uk   us   old-fashioned or offensive
If you say that someone is mentally defective, you mean that they have low mental abilities because their brain is damaged due to an accident or illness, or has been damaged since birth.
Translations of “mentally defective”
in Chinese (Traditional) 有心理缺陷的,有智力缺陷的…
in Chinese (Simplified) 有心理缺陷的,有智力缺陷的…
(Definition of mentally defective from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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