invalidness vs invalid

invalidness and invalid both are nouns.

Word	Noun	Adjective	Verb	Adverb
invalidness	Yes	No	No	No
invalid	Yes	Yes	Yes	No

invalidness (noun)	invalid (noun)
illogicality as a consequence of having a conclusion that does not follow from the premisses	someone who is incapacitated by a chronic illness or injury

invalidness (adjective)	invalid (adjective)
	having no cogency or legal force
	no longer valid

invalidness (verb)	invalid (verb)
	injure permanently
	force to retire, remove from active duty, as of firemen