from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Not adhering to promises, obligations, or allegiances; disloyal. See Synonyms at faithless.
- adj. Not true or constant to one's sexual partner.
- adj. Not true to one's spouse; guilty of adultery.
- adj. Not justly representing or reflecting the original; inaccurate.
- adj. Obsolete Deficient in or lacking religious faith; unbelieving.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Not having religious faith
- adj. Not keeping good faith; disloyal; not faithful
- adj. Not honest or upright
- adj. Of a translation: incorrect
- adj. Adulterous
from the GNU version of the Collaborative International Dictionary of English
- adj. Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious
- adj. Not possessing faith; infidel.
from The Century Dictionary and Cyclopedia
- Not faithful; not observant of promises, vows, allegiance, or duty.
- Not performing the proper duty or function.
- Not possessing faith; unbelieving; impious; infidel. Not trustworthy; inexact; not conforming to the letter and spirit: as, an unfaithful account; an unfaithful translation.
- Synonyms Faithless, etc. (see perfidious); derelict.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
- adj. not trustworthy
- adj. having the character of, or characteristic of, a traitor
- adj. not true to duty or obligation or promises
From un- + faithful (Wiktionary)