treacherous Definition in the Cambridge English Dictionary
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Definition of “treacherous” - English Dictionary

Definition of "treacherous" - American English Dictionary

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treacherousadjective

 us   /ˈtretʃ·ər·əs/

treacherous adjective (DANGEROUS)

(of the ​ground or the ​sea) ​extremelydangerous, esp. because of ​badweatherconditions: Freezing ​rain made ​driving treacherous.

treacherous adjective (NOT LOYAL)

(of a ​person) ​guilty of ​deceiving someone who ​trusts you: He was treacherous, or at least ​sneaky.
(Definition of treacherous from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "treacherous" - British English Dictionary

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treacherousadjective

uk   /ˈtretʃ.ər.əs/  us   /-ɚ-/

treacherous adjective (DANGEROUS)

If the ​ground or ​sea is treacherous, it is ​extremelydangerous, ​especially because of ​badweatherconditions: Snow and ​ice have ​left many ​roads treacherous, and ​drivers are ​warned to use ​caution.

treacherous adjective (NOT LOYAL)

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 ​generalcriticisms of women.
(Definition of treacherous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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