Definition of treacherously adverb from the Oxford Advanced Learner's Dictionary

     

    treacherously

     adverb
    adverb
    BrE BrE//ˈtretʃərəsli//
     
    ; NAmE NAmE//ˈtretʃərəsli//
     
     
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  1. 1in a way that involves hurting somebody who trusts you The king had been treacherously murdered by his brother.
  2. 2in a dangerous way, especially when something seems safer than it is treacherously icy conditions on the roads