unfriendly vs unfriendliness

unfriendly is not a noun while unfriendliness is a noun.

Word	Noun	Adjective	Verb	Adverb
unfriendly	No	Yes	No	No
unfriendliness	Yes	No	No	No

unfriendly (noun)	unfriendliness (noun)
	an unfriendly disposition
	dislike experienced as an absence of friendliness

unfriendly (adjective)	unfriendliness (adjective)
not disposed to friendship or friendliness
not easy to understand or use
very unfavorable to life or growth
not friendly