unsound vs unsoundness

unsound is not a noun while unsoundness is a noun.

Word	Noun	Adjective	Verb	Adverb
unsound	No	Yes	No	No
unsoundness	Yes	No	No	No

unsound (noun)	unsoundness (noun)
	not mentally or physically healthy
	a misconception that is fallacious and not true or valid
	a condition of damage or decay

unsound (adjective)	unsoundness (adjective)
not sound financially
not in good condition; damaged or decayed
suffering from severe mental illness
containing or based on a fallacy
physically unsound or diseased
of e.g. advice