unnatural vs naturalness

unnatural is not a noun while naturalness is a noun.

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

unnatural (noun)	naturalness (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

unnatural (adjective)	naturalness (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