WordReference Random House Unabridged Dictionary of American English © 2026
dun•der•head  (dun′dər hed′),USA pronunciation n. 
    a dunce; blockhead;
    numbskull. Also called dun•der•pate  (dun′dər pāt′).USA pronunciation 
    • Dutch dunder(kop) numbskull (dunder thunder + kop head) + head
    • apparently 1615–25
    dun′der•head′ed, adj. 
    dun′der•head′ed•ness, n. 

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