Meaning of “treacherous” in the English Dictionary

"treacherous" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"treacherous" in American English

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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)