unsoundness vs unsound

unsoundness is a noun but unsound is not a noun.

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

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

unsoundness (adjective)	unsound (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