perfidious vs unfaithful

perfidious and unfaithful both are adjectives.

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

perfidious (adjective)	unfaithful (adjective)
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans	not true to duty or obligation or promises
	having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
	having the character of, or characteristic of, a traitor
	not trustworthy