Definitions from Wiktionary (imbecile)

▸ noun:  (obsolete) A person with limited mental capacity who can perform tasks and think only like a young child, in medical circles meaning a person who lacks the capacity to develop beyond the mental age of a normal five- to seven-year-old child.
▸ noun:  (derogatory) A fool, an idiot.
▸ adjective:  (dated) Destitute of strength, whether of body or mind; feeble; impotent; especially, mentally weak.
▸ Also see imbecile

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