unresponsiveness vs unresponsive

unresponsiveness is a noun but unresponsive is not a noun.

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

unresponsiveness (noun)	unresponsive (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

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