What is bullheaded in idiom?

"Bullheaded" is not an idiom in itself, but it's used in several idioms that describe stubbornness or a lack of flexibility in thinking:

* "Bullheaded as a mule": This idiom compares someone's stubbornness to that of a mule, known for its strong will and unwillingness to be moved.

* "Too bullheaded to see reason": This idiom emphasizes the inability of a stubborn person to understand or accept different viewpoints.

* "Stubborn as a bullheaded ox": Similar to "bullheaded as a mule," this idiom uses the ox, another animal known for its strong will, to depict stubbornness.

Essentially, "bullheaded" itself is a descriptive adjective that means stubborn, obstinate, and unwilling to change one's mind. These idioms utilize this meaning to emphasize the extreme level of stubbornness.