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

 

knucklehead

 noun
noun
BrE BrE//ˈnʌklhed//
 
; NAmE NAmE//ˈnʌklhed//
 
(North American English, informal) Stupid
 
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a person who behaves in a stupid way Anybody but a complete knucklehead could do the job. See related entries: Stupid
See the Oxford Advanced American Dictionary entry: knucklehead