obscureness vs unimportance

obscureness and unimportance both are nouns.

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

As nouns, obscureness and unimportance are synonyms defined as:

Other synonyms of obscureness include humbleness, lowliness.

obscureness (noun)	unimportance (noun)
the quality of being unclear or abstruse and hard to understand	the quality of not being important or worthy of note
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