unsuitable vs unsuitableness

unsuitable is not a noun while unsuitableness is a noun.

Word	Noun	Adjective	Verb	Adverb
unsuitable	No	Yes	No	No
unsuitableness	Yes	No	No	No

unsuitable (noun)	unsuitableness (noun)
	the quality of having the wrong properties for a specific purpose

unsuitable (adjective)	unsuitableness (adjective)
not conducive to good moral development
not worthy of being chosen (especially as a spouse)
not meant or adapted for a particular purpose
not capable of being applied