unfaithful vs faithful

unfaithful is not a noun while faithful is a noun.

Word	Noun	Adjective	Verb	Adverb
unfaithful	No	Yes	No	No
faithful	Yes	Yes	No	No

unfaithful (noun)	faithful (noun)
	a group of people who adhere to a common faith and habitually attend a given church
	any loyal and steadfast following

unfaithful (adjective)	faithful (adjective)
not true to duty or obligation or promises	steadfast in affection or allegiance
having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend	not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend
having the character of, or characteristic of, a traitor	marked by fidelity to an original
not trustworthy