pretentiousness vs unpretentiousness

pretentiousness and unpretentiousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pretentiousness	Yes	No	No	No
unpretentiousness	Yes	No	No	No

pretentiousness (noun)	unpretentiousness (noun)
the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)	the quality of being natural and without pretensions
lack of elegance as a consequence of being pompous and puffed up with vanity