calumny vs calumnious

calumny is a noun but calumnious is not a noun.

Word	Noun	Adjective	Verb	Adverb
calumny	Yes	No	No	No
calumnious	No	Yes	No	No

calumny (noun)	calumnious (noun)
an abusive attack on a person's character or good name
a false accusation of an offense or a malicious misrepresentation of someone's words or actions

calumny (adjective)	calumnious (adjective)
	(used of statements) harmful and often untrue; tending to discredit or malign