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Definition of “treacherous” - English Dictionary

"treacherous" in American English

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treacherousadjective

 us   /ˈtretʃ·ər·əs/
  • treacherous adjective (DANGEROUS)

(of the ground or the sea) extremely dangerous, esp. because of bad weather conditions: 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)







"treacherous" in British English

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treacherousadjective

uk   /ˈtretʃ.ər.əs/  us   /ˈtretʃ.ɚ.əs/
  • 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 general criticisms of women.
(Definition of treacherous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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