adjective. Extremely or irrationally stubborn; headstrong. synonym: obstinate.

Having a head like that of a bull.

Hence Obstinate; blunderingly aggressive; stupid.

Having a blunt, thick, or massive head.

adjective. Having a head like that of a bull. Fig.: Headstrong; obstinate; dogged.

adjective. unreasonably stubborn.

adjective. obstinate and stupid

"[2] "Almost prehistoric" was the verdict of the distinguished film editor Ralph Rosenblum, who worked on The Producers and has reminisced none too flatteringly about his sole collaboration with Brooks, whom he characterizes as a bullheaded amateur who had no idea how to use the resources of the camera to create humor."

bull-headed rail  

obstinate  stubborn  unregenerate  

beak-nosed  bloody-minded  bulldog  cheery-looking  cushiony  

adherent  adhesive  balking  balky  bigoted