trashiness vs ineptitude

trashiness and ineptitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
trashiness	Yes	No	No	No
ineptitude	Yes	No	No	No

As nouns, ineptitude is a hypernym of trashiness; that is, ineptitude is a word with a broader meaning than trashiness:

Other hypernyms of trashiness include worthlessness.

trashiness (noun)	ineptitude (noun)
the quality of being cheaply imitative of something better	having no qualities that would render it valuable or useful
	unskillfulness resulting from a lack of training