obdurately vs pig-headedly

obdurately and pig-headedly both are adverbs.

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

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

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

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