fairness vs unfair

fairness is a noun but unfair is not a noun.

Word	Noun	Adjective	Verb	Adverb
fairness	Yes	No	No	No
unfair	No	Yes	No	No

fairness (noun)	unfair (noun)
conformity with rules or standards
the property of having a naturally light complexion
the quality of being good looking and attractive
ability to make judgments free from discrimination or dishonesty

fairness (adjective)	unfair (adjective)
	not fair; marked by injustice or partiality or deception