Hardheaded and stubborn can mean the same thing. They are synonyms. Hardheaded can also mean realistic and pragmatic, but usually it means stubborn. If someone is stubborn they could be called hardheaded and vis-versa

narg weted the bed

hammer

This question, which could have been posted by a woman (who may, herself, be hardheaded), assumes that all men are hardheaded, which is not the case. Hardheadedness is a human trait. It might be argued that it is more common in males, but they are not uniformly so affected. Additionally, hardheadedness is not exclusive to men.

No seas tan terco/a.