sensitivity vs desensitizing

sensitivity is a noun but desensitizing is not a noun.

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

sensitivity (noun)	desensitizing (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)	desensitizing (adjective)
	making less susceptible or sensitive to either physical or emotional stimuli