unresponsive vs unresponsiveness

unresponsive is not a noun while unresponsiveness is a noun.

Word	Noun	Adjective	Verb	Adverb
unresponsive	No	Yes	No	No
unresponsiveness	Yes	No	No	No

unresponsive (noun)	unresponsiveness (noun)
	the quality of being unresponsive; not reacting; as a quality of people, it is marked by a failure to respond quickly or with emotion to people or events

unresponsive (adjective)	unresponsiveness (adjective)
not responding to some influence or stimulus
aloof or indifferent
not susceptible to suggestion or influence