insensitivity vs insensitiveness

insensitivity and insensitiveness both are nouns.

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

As nouns, insensitivity and insensitiveness are synonyms defined as:

insensitivity and insensitiveness: the inability to respond to affective changes in your interpersonal environment

insensitivity (noun)	insensitiveness (noun)
the inability to respond to affective changes in your interpersonal environment	the inability to respond to affective changes in your interpersonal environment