mental deficiency

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Related to mental deficiencies: Mentally challenged
See: insanity
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Miss Cooley (Janet Fontaine), Lucius' guardian, bundles him off to a state-run institution for boys with mental deficiencies, hoping she can land a man more easily when she's unencumbered by his weird presence.
BABIES exposed to high levels of air pollution while still in the womb are almost three times more likely to develop mental deficiencies.
Babies born to women who had eaten fish from these waters often were blind or deaf, with "unusually small heads and deformed teeth;" even those who looked normal exhibited signs of mental deficiencies.
The rodents' mental deficiencies extended into adulthood, the team found.