stubbornly vs mulishly

stubbornly and mulishly both are adverbs.

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

As adverbs, stubbornly and mulishly are synonyms defined as:

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

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