treacherous - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “treacherous”

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treacherous

adjective
 
 
/ˈtretʃərəs/
DANGEROUS very dangerous, especially because of bad weather conditions: Ice had made the roads treacherous.Dangers and threats
NOT LOYAL formal If someone is treacherous, they deceive people who trust them.Disloyalty, betrayal and treason
(Definition of treacherous from the Cambridge Learners Dictionary © Cambridge University Press)
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