insensitive vs sensitiveness

insensitive is not a noun while sensitiveness is a noun.

Word	Noun	Adjective	Verb	Adverb
insensitive	No	Yes	No	No
sensitiveness	Yes	No	No	No

insensitive (noun)	sensitiveness (noun)
	the ability to respond to physical stimuli or to register small physical amounts or differences
	the ability to respond to affective changes in your interpersonal environment
	(physiology) responsiveness to external stimuli; the faculty of sensation
	sensitivity to emotional feelings (of self and others)

insensitive (adjective)	sensitiveness (adjective)
not responsive to physical stimuli
deficient in human sensibility; not mentally or morally sensitive