sensitivity vs insensitive

sensitivity is a noun but insensitive is not a noun.

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

sensitivity (noun)	insensitive (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)
susceptibility to a pathogen

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