unfaithful vs inconstant

unfaithful and inconstant both are adjectives.

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

unfaithful (adjective)	inconstant (adjective)
not true to duty or obligation or promises	likely to change frequently often without apparent or cogent reason; variable
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