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English definition of “imbecile”

imbecile

noun [C]     /ˈɪm.bə.siːl/ US  /-sɪl/
a person who behaves in a stupid way: What an imbecile that boy is!Stupid and silly people imbecilic     /ˌɪm.bəˈsɪl.ɪk/ adjective (also imbecile) That was an imbecilic thing to do! She looked at me with an imbecile grin.Stupid and sillyOf unsound mind
(Definition of imbecile noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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