thickheaded

adjective
thick·​head·​ed | \ˈthik-ˌhe-dəd \

Definition of thickheaded 

1 : sluggish and obtuse of mind

2 : having a thick head

First Known Use of thickheaded

1691, in the meaning defined at sense 1

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The first known use of thickheaded was in 1691

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