obstinately vs mulishly

obstinately and mulishly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
obstinately	No	No	No	Yes
mulishly	No	No	No	Yes

As adverbs, obstinately and mulishly are synonyms defined as:

Other synonyms of obstinately include cussedly, obdurately, pig-headedly, stubbornly.

obstinately (adverb)	mulishly (adverb)
in a stubborn unregenerate manner	in a stubborn unregenerate manner