Bullheaded and Harum-scarum

Bullheaded adjective - Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion.

Harum-scarum and bullheaded are semantically related. In some cases you can use "Harum-scarum" instead an adjective "Bullheaded".

Harum-scarum adjective - Having or showing a lack of concern for the consequences of one's actions.

Bullheaded and harum-scarum are semantically related. Sometimes you can use "Bullheaded" instead an adjective phrase "Harum-scarum".