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

 

dunderhead

 noun
noun
BrE BrE//ˈdʌndəhed//
 
; NAmE NAmE//ˈdʌndərhed//
 
(informal)
 
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a silly or stupid person Word Origin early 17th cent.: compare with obsolete Scots dunder, dunner ‘resounding noise’; related to din.
See the Oxford Advanced American Dictionary entry: dunderhead