naturalness vs unnatural

naturalness is a noun but unnatural is not a noun.

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

naturalness (noun)	unnatural (noun)
the quality of being natural or based on natural principles
the likeness of a representation to the thing represented
the quality of innocent naivete

naturalness (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