hardheaded vs mulish

hardheaded and mulish both are adjectives.

Word	Noun	Adjective	Verb	Adverb
hardheaded	No	Yes	No	No
mulish	No	Yes	No	No

As adjectives, hardheaded and mulish are synonyms defined as:

hardheaded and mulish: unreasonably rigid in the face of argument or entreaty or attack

hardheaded (adjective)	mulish (adjective)
guided by practical experience and observation rather than theory	unreasonably rigid in the face of argument or entreaty or attack
unreasonably rigid in the face of argument or entreaty or attack