unimportance vs obscureness

unimportance and obscureness both are nouns.

Word	Noun	Adjective	Verb	Adverb
unimportance	Yes	No	No	No
obscureness	Yes	No	No	No

As nouns, unimportance and obscureness are synonyms defined as:

Other synonyms of unimportance include humbleness, lowliness.

unimportance (noun)	obscureness (noun)
the quality of not being important or worthy of note	the quality of being unclear or abstruse and hard to understand
the state of being humble and unimportant	the state of being humble and unimportant
	the state of being indistinct or indefinite for lack of adequate illumination