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[im-buh-sil, -suh l or, esp. British, -seel] /ˈɪm bə sɪl, -səl or, esp. British, -ˌsil/

Informal. a dunce; blockhead; dolt:
Don’t stand there like an imbecile. Open the door!.
Psychology. (no longer in technical use; now considered offensive) a person of the second order in a former and discarded classification of mental retardation, above the level of idiocy, having a mental age of seven or eight years and an intelligence quotient of 25 to 50.
Informal. stupid; silly; absurd.
Usually Offensive. showing mental feebleness or incapacity.
Archaic. weak or feeble.
noun (ˈɪmbɪˌsiːl; -ˌsaɪl)
(psychol) a person of very low intelligence (IQ of 25 to 50), usually capable only of guarding himself against danger and of performing simple mechanical tasks under supervision
(informal) an extremely stupid person; dolt
of or like an imbecile; mentally deficient; feeble-minded
stupid or senseless: an imbecile thing to do

1540s, imbecille “weak, feeble” (especially in reference to the body), from Middle French imbecile (15c.), from Latin imbecillus “weak, feeble” (see imbecility). Sense shifted to mental weakness from mid-18c. As a noun, “feeble-minded person,” it is attested from 1802. Traditionally an adult with a mental age of roughly 6 to 9 (above an idiot but beneath a moron).

imbecile im·be·cile (ĭm’bə-sĭl, -səl)
A person of moderate to severe mental retardation having a mental age of from three to seven years and generally being capable of some degree of communication and performance of simple tasks under supervision. The term belongs to a classification system no longer in use and is now considered offensive.
im’be·cil’i·ty (-sĭl’ĭ·tē) n.


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