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
With treacherous weather hampering flights into Washington, a handful of House members on both sides of the aisle were forced to hit the road overnight to make it in time to vote on the bill.
—
Dave Goldiner, New York Daily News, 2 July 2025
In a striking contrast to the sweltering heat gripping much of the East Coast, a 55-year-old hiker from Texas was rescued in frigid and treacherous conditions Friday evening from the high peaks of New Hampshire's White Mountains.
—Sarah Rumpf-Whitten, FOXNews.com, 24 June 2025
Heavy rain forced the suspension of round 2, pushing unfinished play into Saturday and leaving the course even more treacherous.
—Devlina Sarkar, MSNBC Newsweek, 14 June 2025
At least three people were killed in the treacherous flood waters streaming through a mountain village in New Mexico, which also knocked an entire home from its foundations and then swept it away.
—Jessica Schladebeck, New York Daily News, 9 July 2025
See All Example Sentences for treacherous
Dave Goldiner, New York Daily News, 2 July 2025
In a striking contrast to the sweltering heat gripping much of the East Coast, a 55-year-old hiker from Texas was rescued in frigid and treacherous conditions Friday evening from the high peaks of New Hampshire's White Mountains.
—Sarah Rumpf-Whitten, FOXNews.com, 24 June 2025
Heavy rain forced the suspension of round 2, pushing unfinished play into Saturday and leaving the course even more treacherous.
—Devlina Sarkar, MSNBC Newsweek, 14 June 2025
At least three people were killed in the treacherous flood waters streaming through a mountain village in New Mexico, which also knocked an entire home from its foundations and then swept it away.
—Jessica Schladebeck, New York Daily News, 9 July 2025
See All Example Sentences for treacherous
Recent Examples of Synonyms for treacherous
Adjective
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There's a delicious whodunit aspect to it, too, as the list of five potentially traitorous suspects includes the operative's own high-profile wife (Cate Blanchett).—
Brian Truitt,
USA Today,
4 July 2025
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Michael Fassbender plays a British intelligence officer tasked with finding who leaked a top-secret software program and betrayed their country, and the list of five potentially traitorous suspects includes his own high-profile wife (Cate Blanchett).—
Brian Truitt,
USA Today,
10 May 2025
Adjective
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Implied in his statement was that the U.S. has become unreliable because of Trump’s haphazard tariff regime, which has gone through aggressive threats and reversals.—
Josh Boak,
Chicago Tribune,
17 July 2025
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Despite the resumptions in service, officials in each area warned residents and business owners that service could be spotty and unreliable in the coming days, and no one ventured to guess when trash service would be restored to normal.—
Caelyn Pender,
Mercury News,
16 July 2025
Adjective
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He’s hosted several world leaders for explosive Oval Office sit downs, including South African President Cyril Ramaphosa, who Trump argued with over false claims that white farmers in the country were victims of a genocide, and Ukrainian President Volodymyr Zelenskyy in February.—
Sara Dorn,
Forbes.com,
16 July 2025
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In November 2009, Richard pleaded guilty to the latter charge, while Mayumi pleaded guilty to a misdemeanor charge of false reporting to authorities, per CNN.—
EW.com,
EW.com,
15 July 2025
Cite this Entry
“Treacherous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/treacherous. Accessed 29 Jul. 2025.
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