as in traitorous
not true in one's allegiance to someone or something
a treacherous "friend," she's been known to turn against people in the blink of an eye
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Recent Examples of treacherous
Finally, a suite of lunar science initiatives that can be utilized even without landing on the moon’s surface will aim to enhance NASA’s understanding of the rocky, treacherous terrain.
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Jackie Wattles, CNN Money, 31 Dec. 2025
The wild storm hit parts of the Plains and Great Lakes this week with sharply colder air, strong winds and a mix of snow, ice and rain, leading to treacherous travel.
—Holly Ramer, Fortune, 30 Dec. 2025
Combine that snow with fog, high winds, blowing snow, rapidly dropping temperatures and slick roads – and travel will be treacherous the next two days.
—Hope Karnopp, jsonline.com, 28 Dec. 2025
To reach the cats’ habitat, researchers had to tackle treacherous terrain in peat swamp forests, confronting chest-high waters and tangled mangroves.
—Maria Mocerino, Interesting Engineering, 27 Dec. 2025
See All Example Sentences for treacherous
Recent Examples of Synonyms for treacherous
Adjective
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Russell fabricates a lie with the rest of the villains, and the heroes believe it, despite a warning from one traitorous tribemate.—
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That video drew the ire of President Donald Trump, who deemed it traitorous.—
Adjective
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However, these boat routes can be limited, and buying tickets on-site has historically been unreliable due to shifting timetables.—
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Designed to be compact and portable, HyDee is targeted at outdoor, industrial, and emergency applications, including scenarios where access to the electrical grid is unreliable or nonexistent.—
Adjective
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Plants that provide winter interest, including sedums, goldenrod, blue false indigo, and ornamental grasses.—
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Today’s teenagers can produce a TikTok video in minutes, but how many of them will learn to analyze the president’s false claim that Tylenol causes autism?—
Cite this Entry
“Treacherous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/treacherous. Accessed 12 Jan. 2026.
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