unnaturally vs by artificial means

unnaturally and by artificial means both are adverbs.

Word	Noun	Adjective	Verb	Adverb
unnaturally	No	No	No	Yes
by artificial means	No	No	No	Yes

As adverbs, unnaturally and by artificial means are synonyms defined as:

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

Other synonyms of unnaturally include artificially.

unnaturally (adverb)	by artificial means (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