Definition of thickheaded adjective from the Oxford Advanced Learner's Dictionary

 

thickheaded

 adjective
adjective
BrE BrE//ˌθɪkˈhedɪd//
 
; NAmE NAmE//ˌθɪkˈhedɪd//
 
Stupid
 
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See the Oxford Advanced American Dictionary entry: thickheaded