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

dunderhead

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