insensitiveness vs unfitness

insensitiveness and unfitness both are nouns.

Word	Noun	Adjective	Verb	Adverb
insensitiveness	Yes	No	No	No
unfitness	Yes	No	No	No

As nouns, unfitness is a hypernym of insensitiveness; that is, unfitness is a word with a broader meaning than insensitiveness:

insensitiveness: the inability to respond to affective changes in your interpersonal environment
unfitness: lacking the power to perform

Other hypernyms of insensitiveness include inability.

insensitiveness (noun)	unfitness (noun)
the inability to respond to affective changes in your interpersonal environment	the quality of not being suitable
	lacking the power to perform
	poor physical condition; being out of shape or out of condition (as from a life of ease and luxury)