unnaturalness vs unnatural

unnaturalness is a noun but unnatural is not a noun.

Word	Noun	Adjective	Verb	Adverb
unnaturalness	Yes	No	No	No
unnatural	No	Yes	No	No

unnaturalness (noun)	unnatural (noun)
the quality of being unnatural or not based on natural principles

unnaturalness (adjective)	unnatural (adjective)
	not in accordance with or determined by nature; contrary to nature
	not normal; not typical or usual or regular or conforming to a norm
	speaking or behaving in an artificial way to make an impression