Relating to or lacking the mind; characterized by intellectual deficiency or absence of mental faculties.
From Latin 'a-' (without) + 'mentalis' (of the mind), creating an adjective meaning 'without mental capacity,' used in older psychiatric terminology.
This word is now considered outdated and inappropriate in modern psychology, replaced by person-first language like 'person with intellectual disability'—showing how medical language evolves to be more respectful.
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