Definition of treacherous adjective from the Oxford Advanced American Dictionary

     

    treacherous

     adjective
    adjective
    NAmE//ˈtrɛtʃərəs//
     
     
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  1. 1that cannot be trusted; intending to harm you synonym deceitful He was weak, cowardly, and treacherous. lying, treacherous words
  2. 2dangerous, especially when seeming safe The ice on the roads made driving conditions treacherous.
treacherously
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: treacherous