Meaning of “mentally defective” in the English Dictionary

british dictionary

"mentally defective" in British English

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mentally defectiveadjective

uk /ˌmen.təl.i dɪˈfek.tɪv/ us /ˌmen.t̬əl.i dɪˈfek.tɪv/ 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.

(Definition of “mentally defective” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)