insensibility vs unfeelingness

insensibility and unfeelingness both are nouns.

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

As nouns, insensibility and unfeelingness are synonyms defined as:

insensibility and unfeelingness: devoid of passion or feeling; hardheartedness

Other synonyms of insensibility include callosity, callousness, hardness.

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