mental deficiency

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Related to mental deficiencies: Mentally challenged
See: insanity
References in periodicals archive ?
She was smart, educated and had no signs of mental deficiencies.
In pleading the insanity defense, the lawyer for Levi Aron, accused killer of eight-year-old Leiby Kletzky, suggested that the inbreeding in that Brooklyn Hasidic community may have led to his client's mental deficiencies.
THE Mental Deficiencies Act 1913 allowed the detention of patients known to be sane but labelled "morally defective".
The birth of a child with Down syndrome (DS) has many serious implications--physical and mental deficiencies, medical conditions and lifestyle challenges.