stubbornly vs pig-headedly

stubbornly and pig-headedly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
stubbornly	No	No	No	Yes
pig-headedly	No	No	No	Yes

As adverbs, stubbornly and pig-headedly are synonyms defined as:

Other synonyms of stubbornly include cussedly, mulishly, obdurately, obstinately.

stubbornly (adverb)	pig-headedly (adverb)
in a stubborn unregenerate manner	in a stubborn unregenerate manner