Synonym Chooser

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

Some common synonyms of treacherous are disloyal, faithless, false, perfidious, and traitorous. While all these words mean "untrue to what should command one's fidelity or allegiance," treacherous implies readiness to betray trust or confidence.

a treacherous adviser

When can disloyal be used instead of treacherous?

Although the words disloyal and treacherous have much in common, disloyal implies a lack of complete faithfulness to a friend, cause, leader, or country.

disloyal to their country

When could faithless be used to replace treacherous?

While in some cases nearly identical to treacherous, faithless applies to any failure to keep a promise or pledge or any breach of allegiance or loyalty.

faithless allies

Where would false be a reasonable alternative to treacherous?

The words false and treacherous are synonyms, but do differ in nuance. Specifically, 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, in the sense of treacherous?

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 treacherous?

The synonyms traitorous and treacherous are sometimes interchangeable, but traitorous implies either actual treason or a serious betrayal of trust.

traitorous acts punishable by death

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of treacherous Related Stories Erin and Charlie start out their weekend by attempting to get some fresh air and wandering through the desert — perhaps a bit of an obvious metaphor for a couple navigating treacherous terrain. Stephen Saito, Variety, 19 Mar. 2025 That might be too tough a path after a treacherous regular season in the SEC. Rohan Nadkarni, NBC News, 17 Mar. 2025 Combined with a light glaze of ice that could fall before temperatures drop, travel in the area could be treacherous that day, the weather service said. Sean Murphy and Russ Bynum, Los Angeles Times, 15 Mar. 2025 The legendary Stadium, Mountain, and Dunes courses now have bigger and faster greens as well as more treacherous hazards. Passport By Forbeslife, Forbes, 14 Mar. 2025 See All Example Sentences for treacherous
Recent Examples of Synonyms for treacherous
Adjective
  • Foreign military interventions can change victims from being viewed as a nuisance into being seen as powerful and traitorous enemies, potentially capable of exacting revenge, seizing power, or breaking away from the state.
    Benjamin A. Valentino, Foreign Affairs, 17 Oct. 2011
  • But what will their first move as a traitorous duo be?
    Tom Smyth, Vulture, 27 Feb. 2025
Adjective
  • All such theories, however, have appeared to be unreliable and speculative since any first strikes would have to contend with the risk of an enemy launch on warning as well as sufficient systems surviving for a devastating riposte.
    Lawrence D. Freedman, Foreign Affairs, 14 Apr. 2025
  • Some customers worry Crusoe’s cloud system is unreliable.
    Christopher Helman, Forbes.com, 10 Apr. 2025
Adjective
  • But the jitters still shook him, a false-start whistle blowing on his first 40-yard attempt at February’s NFL combine.
    Luca Evans, Denver Post, 13 Apr. 2025
  • As with most of his career as a conspiracist, RFK is tying together little kernels of truth into a false narrative and then framing it as just asking common-sense.
    New York Daily News Editorial Board, New York Daily News, 12 Apr. 2025

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Cite this Entry

“Treacherous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/treacherous. Accessed 22 Apr. 2025.

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