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English definition of “imbecile”

imbecile

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