IMBECILE
imbecile, imbecilic, idiotic
(adjective) having a mental age of three to seven years
idiot, imbecile, cretin, moron, changeling, half-wit, retard
(noun) a person of subnormal intelligence
Source: WordNet® 3.1
Etymology
Noun
imbecile (plural imbeciles)
(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.
(pejorative) A fool, an idiot.
Usage notes
• In modern times, “imbecile” is often used in jocular insults.
Synonyms
• See also idiot
Adjective
imbecile (comparative more imbecile, superlative most imbecile)
(dated) Destitute of strength, whether of body or mind; feeble; impotent; especially, mentally weak.
hospitals for the imbecile and insane
Source: Wiktionary
Im"be*cile, a. Etym: [L. imbecillis, and imbecillus; of unknown
origin: cf. F. imbécile.]
Definition: Destitute of strength, whether of body or mind; feeble;
impotent; esp., mentally wea; feeble-minded; as, hospitals for the
imbecile and insane.
Syn.
– Weak; feeble; feeble-minded; idiotic.
Im"be*cile, n.
Definition: One destitute of strength; esp., one of feeble mind.
Im"be*cile, v. t.
Definition: To weaken; to make imbecile; as, to imbecile men's courage.
[Obs.] Jer. Taylor.
Source: Webster’s Unabridged Dictionary 1913 Edition