- not faithful; false to duty, obligation, or promises; disloyal: Given how unfaithful the party has been to voters, it would be surprising if they won.
- not sexually loyal to a spouse or lover; adulterous: She was concerned her husband would be unfaithful when he travelled.
- not accurate or complete; inexact: The book was an unfaithful translation of the original.
- without religious faith; unbelieving.
- not true to a promise, vow, etc
- not true to a wife, husband, lover, etc, esp in having sexual intercourse with someone else
- inaccurate; inexact; unreliable; untrustworthy
- not having religious faith; infidel
- not upright; dishonest
