|1.||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|
|2.||informal an extremely stupid person; dolt|
|3.||of or like an imbecile; mentally deficient; feeble-minded|
|4.||stupid or senseless: an imbecile thing to do|
|[C16: from Latin imbēcillus feeble (physically or mentally)]|
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.