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treacherous

adjective (DANGEROUS)
 
 
/ˈtretʃ.ər.əs/ US  /-ɚ-/

Definition

If the ground or sea is treacherous, it is extremely dangerous, especially because of bad weather conditions: Snow and ice have left many roads treacherous, and motorists are warned to drive slowly.Dangers and threatsDescribing bad weather
(Definition of treacherous adjective (DANGEROUS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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