Synonyms of faithless

faithless

adjective

ˈfāth-ləs 

as in traitorous

not true in one's allegiance to someone or something

faithless friends who deserted him in his time of need

Synonyms & Similar Words

• traitorous
• unreliable
• false
• unfaithful
• treacherous
• disloyal
• perfidious
• fickle
• inconstant
• untrue
• recreant
• irresponsible
• untrustworthy
• hesitant
• undependable
• uncertain
• irresolute
• faltering
• apathetic
• uninterested
• dubious
• trustless
• wavering
• dispassionate
• vacillating

Antonyms & Near Antonyms

• faithful
• loyal
• true
• devout
• constant
• steadfast
• steady
• responsible
• staunch
• reliable
• dutiful
• fast
• devoted
• trustworthy
• dedicated
• dependable
• solid
• trusty
• down-the-line
• tried
• resolute
• unhesitating
• unfaltering
• determined
• inveterate
• intent
• tried-and-true
• confirmed
• enthusiastic
• ardent
• passionate
• trustable
• fervent
• unwavering
• impassioned
• sworn
• avid
• fervid
• dyed-in-the-wool

Synonym Chooser

How is the word faithless different from other adjectives like it?

Some common synonyms of faithless are disloyal, false, perfidious, traitorous, and treacherous. While all these words mean "untrue to what should command one's fidelity or allegiance," faithless applies to any failure to keep a promise or pledge or any breach of allegiance or loyalty.

faithless allies

When can disloyal be used instead of faithless?

The synonyms disloyal and faithless are sometimes interchangeable, but disloyal implies a lack of complete faithfulness to a friend, cause, leader, or country.

disloyal to their country

When could false be used to replace faithless?

In some situations, the words false and faithless are roughly equivalent. However, false stresses the fact of failing to be true in any manner ranging from fickleness to cold treachery.

betrayed by false friends

How do perfidious and faithless relate to one another?

Perfidious adds to faithless the implication of an incapacity for fidelity or reliability.

a perfidious double-crosser

When is traitorous a more appropriate choice than faithless?

While the synonyms traitorous and faithless are close in meaning, traitorous implies either actual treason or a serious betrayal of trust.

traitorous acts punishable by death

When might treacherous be a better fit than faithless?

The meanings of treacherous and faithless largely overlap; however, treacherous implies readiness to betray trust or confidence.

a treacherous adviser

Example Sentences

Recent Examples of faithless

Consumed by rage and betrayal, Eleanor is driven to take a bloody, supernatural revenge upon her faithless husband. — Robert Lang, Deadline, 27 Dec. 2025

Spouses, in this gritty Philadelphia suburb, are mostly faithless, absent or dead. — Angie Han, HollywoodReporter, 28 Aug. 2025

Men are a structuring absence, as they are spoken of as faithless husbands, potential fiancés, feckless sons. — John Bleasdale, Variety, 21 Nov. 2024

Don Cheadle and Benicio del Toro are both quite good as part of a team that’s tasked with stealing a secret document, setting the stage for a drama involving gangsters, faithless lovers, and white-collar crooks. — Tim Grierson, Vulture, 7 July 2021