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English definition of “treacherous”

treacherous

adjective (NOT LOYAL)    /ˈtretʃ.ər.əs/ US  /-ɚ-/
A person who is treacherous deceives someone who trusts them, or has no loyalty: Vargas plays the part of a treacherous aristocrat who betrays his king and country. I feel a bit treacherous to my own sex if I ever make general criticisms of women.Disloyalty, betrayal and treason
(Definition of treacherous adjective (NOT LOYAL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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