artificially vs unnaturally

artificially and unnaturally both are adverbs.

Word	Noun	Adjective	Verb	Adverb
artificially	No	No	No	Yes
unnaturally	No	No	No	Yes

As adverbs, artificially and unnaturally are synonyms defined as:

artificially and unnaturally: not according to nature; not by natural means

Other synonyms of artificially include by artificial means.

artificially (adverb)	unnaturally (adverb)
not according to nature; not by natural means	not according to nature; not by natural means
	in an unnatural way
	in a manner at variance with what is natural or normal