unfeelingness vs callousness

unfeelingness and callousness both are nouns.

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

As nouns, unfeelingness and callousness are synonyms defined as:

unfeelingness and callousness: devoid of passion or feeling; hardheartedness

Other synonyms of unfeelingness include callosity, hardness, insensibility.

unfeelingness (noun)	callousness (noun)
devoid of passion or feeling; hardheartedness	devoid of passion or feeling; hardheartedness