faithless vs unfaithful

faithless and unfaithful both are adjectives.

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

As adjectives, faithless and unfaithful are synonyms defined as:

faithless and unfaithful: having the character of, or characteristic of, a traitor

Other synonyms of faithless include traitorous, treasonable, treasonous.

faithless (adjective)	unfaithful (adjective)
having the character of, or characteristic of, a traitor	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