pig-headedly vs obdurately

pig-headedly and obdurately both are adverbs.

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

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

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

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