bull·head·ed 
/ˈbʊlˈhɛdəd/ adjective
/ˈbʊlˈhɛdəd/ adjective [more bullheaded; most bullheaded] chiefly US, disapproving : not willing to change an opinion, plan, etc. : very stubborn in a foolish or annoying way
▪ a bullheaded boss who won't take advice from anyone
▪ a bullheaded boss who won't take advice from anyone
