insensibility vs callousness

insensibility and callousness both are nouns.

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

As nouns, insensibility and callousness are synonyms defined as:

insensibility and callousness: devoid of passion or feeling; hardheartedness

Other synonyms of insensibility include callosity, hardness, unfeelingness.

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