- not faithful; false to duty, obligation, or promises; faithless; disloyal.
- not sexually faithful to a spouse or lover.
- not accurate or complete; inexact: an unfaithful translation.
- Obsolete. unbelieving; infidel.
Origin of unfaithful
SynonymsSee more synonyms for unfaithful on Thesaurus.com
1. untrustworthy, deceitful, treacherous, recreant. 3. imprecise, untrue.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for unfaithfulness
Philip was disgusted with her unfaithfulness to his friend, and that was the reason of his absence.The Manxman
It was not Audrey's unfaithfulness that had hurt him so much as her untruthfulness.Audrey Craven
The system works well, for unfaithfulness is said to be unknown.Ireland as It Is
Robert John Buckley (AKA R.J.B.)
For three years my husband disgusted me with his unfaithfulness.Possessed
Unfaithfulness and negligence are condemned and punished in both.Jesus the Christ
James Edward Talmage
- 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; untrustworthyunfaithful copy
- obsolete not having religious faith; infidel
- obsolete not upright; dishonest
Word Origin and History for unfaithfulness
Online Etymology Dictionary, © 2010 Douglas Harper