unfaithful vs untrue

unfaithful and untrue both are adjectives.

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

unfaithful (adjective)	untrue (adjective)
not true to duty or obligation or promises	not according with the facts
having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend	(used especially of persons) not dependable in devotion or affection; unfaithful
having the character of, or characteristic of, a traitor	not accurately fitted; not level
not trustworthy	not true to an obligation or trust