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English definition of “mentally defective”

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mentally defective

adjective uk   old-fashioned or offensive us  
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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