- treach·er·ous·ly, adverb
- treach·er·ous·ness, noun
- un·treach·er·ous, adjective
- un·treach·er·ous·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use treacherous in a sentence
He spent almost 200 miles dodging massive hornets and fire ants, hopping from downed tree to downed tree, and crossing treacherous rivers with about 100 other racers and nothing but the food he could carry and an occasional water refill.Can a hunter outrun an antelope? This ultra-marathoner is finding out. | By Christine Peterson/Outdoor Life | November 23, 2020 | Popular-Science
Pernigotti said that only those who regularly climb in the Alps can appreciate how warmer weather has made the mountains more treacherous.How Climate Change Is Making the Alps More Dangerous | Agostino Petroni | October 23, 2020 | Outside Online
Observations from Earth suggested Bennu should be smooth and sandy, but when OSIRIS-REx arrived, it found a treacherous, rocky landscape.NASA’s OSIRIS-REx survived its risky mission to grab a piece of an asteroid | Lisa Grossman | October 21, 2020 | Science News
The incident highlighted the treacherous news landscape where both reporters and policymakers now tread, one in which even protecting children can be weaponized by extremists.
To Filner, the treacherous San Diego business insiders, developers and Republicans had rigged the city’s political system to send resources to their pet projects and away from neighborhoods.
True, we travel this treacherous road at our own risk, but … *** Bob Weir: “If you want something for nothing, go jerk off.”
Big scary Transformer-like robots with heads ablaze that frighten the kids back across the treacherous desert?The So-Called Immigration Border Crisis Is Neither | Sally Kohn | July 10, 2014 | THE DAILY BEAST
While the journey north was always treacherous and costly, in the hands of the cartels it has become deadlier than ever.How Mexico’s Cartels Are Behind the Border Kid Crisis | Caitlin Dickson | July 9, 2014 | THE DAILY BEAST
treacherous thatched-roof-haired drag-queen Linda Tripp, with those dress-for-success shoulder pads?
Soviet forces slowed Nazi advances, however, by laying vast and treacherous minefields.
This treacherous sort of calm, we thought, might forbode a storm, and we did not allow it to lull us into security.
The profound and treacherous night with its silence and semblance of peace settled upon the camp.The Awakening and Selected Short Stories | Kate Chopin
In a sudden, blind choler, she swept round, plucked the dagger from Tressan's belt and flung herself upon the treacherous captain.St. Martin's Summer | Rafael Sabatini
Intellectually she is quite sound, but has a treacherous memory, and is very nervous.A Statistical Inquiry Into the Nature and Treatment of Epilepsy | Alexander Hughes Bennett
A faithless woman, if known to be such by the person concerned, is but faithless; if she is believed faithful, she is treacherous.The 'Characters' of Jean de La Bruyre | Jean de La Bruyre
British Dictionary definitions for treacherous
betraying or likely to betray faith or confidence
unstable, unreliable, or dangerous: treacherous weather; treacherous ground
- treacherously, adverb
- treacherousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012