unfeelingness vs insensibility

unfeelingness and insensibility both are nouns.

Word	Noun	Adjective	Verb	Adverb
unfeelingness	Yes	No	No	No
insensibility	Yes	No	No	No

As nouns, unfeelingness and insensibility are synonyms defined as:

unfeelingness and insensibility: devoid of passion or feeling; hardheartedness

Other synonyms of unfeelingness include callosity, callousness, hardness.

unfeelingness (noun)	insensibility (noun)
devoid of passion or feeling; hardheartedness	devoid of passion or feeling; hardheartedness
	a lack of sensibility