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WordReference Random House Learner's Dictionary of American English © 2024treach•er•ous /ˈtrɛtʃərəs/USA pronunciation adj. - of or relating to treachery:the treacherous tyrant who stabbed his friends in the back.
- deceptive or unreliable.
- unstable or insecure;
hazardous:treacherous footing on the icy slope. - dangerous:a treacherous wind nearly capsized the boat.
treach•er•ous•ly, adv. treach•er•ous•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024treach•er•ous (trech′ər əs),USA pronunciation adj. - characterized by faithlessness or readiness to betray trust;
traitorous. - deceptive, untrustworthy, or unreliable.
- unstable or insecure, as footing.
- dangerous;
hazardous:a treacherous climb.
- Anglo-French, equivalent. to trecher deceiver (trech(ier) to deceive + -er -er2) + -ous -ous. Cf. French tricheur trickster
- Middle English trecherous 1300–50
- 1.See corresponding entry in Unabridged unfaithful, faithless, treasonous.
- 2.See corresponding entry in Unabridged deceitful.
- 1.See corresponding entry in Unabridged loyal.
- 2.See corresponding entry in Unabridged reliable.
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