Definition of nincompoop noun from the Oxford Advanced Learner's Dictionary

 

nincompoop

 noun
noun
BrE BrE//ˈnɪŋkəmpuːp//
 
; NAmE NAmE//ˈnɪŋkəmpuːp//
 
(old-fashioned, informal) Stupid
 
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a stupid person See related entries: Stupid Word Origin late 17th cent.: perhaps from the given name Nicholas or from Nicodemus (by association with the Pharisee of this name, and his naive questioning of Christ; compare with French nicodème ‘simpleton’).
See the Oxford Advanced American Dictionary entry: nincompoop