|a.||1.||Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious; |
|2.||Not possessing faith; infidel.|
|Adj.||1.||unfaithful - not true to duty or obligation or promises; "an unfaithful lover"|
faithful - steadfast in affection or allegiance; "years of faithful service"; "faithful employees"; "we do not doubt that England has a faithful patriot in the Lord Chancellor"
|2.||unfaithful - having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend; "her husband was unfaithful"|
faithful - not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend; "he remained faithful to his wife"
|3.||unfaithful - deliberately and abominably disloyal or likely to betray trust or confidence; "the faithless Benedict Arnold"; "a lying traitorous insurrectionist"|
|4.||unfaithful - not trustworthy; "an unfaithful reproduction"|