unbecomingness vs ineptness

unbecomingness and ineptness both are nouns.

Word	Noun	Adjective	Verb	Adverb
unbecomingness	Yes	No	No	No
ineptness	Yes	No	No	No

As nouns, ineptness is a hypernym of unbecomingness; that is, ineptness is a word with a broader meaning than unbecomingness:

unbecomingness: The state of not being flattering, attractive or appropriate.
ineptness: the quality of having the wrong properties for a specific purpose

Other hypernyms of unbecomingness include appearance, visual aspect, unsuitability, unsuitableness.

unbecomingness (noun)	ineptness (noun)
the quality of being unbecoming	the quality of having the wrong properties for a specific purpose
The state of not being flattering, attractive or appropriate.	unskillfulness resulting from a lack of training