perceptiveness vs unperceptiveness

perceptiveness and unperceptiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
perceptiveness	Yes	No	No	No
unperceptiveness	Yes	No	No	No

perceptiveness (noun)	unperceptiveness (noun)
the quality of insight and sympathetic understanding	the lack of insight and sympathetic understanding
delicate discrimination (especially of esthetic values)
perception of that which is obscure
a feeling of understanding