treacherously

/ˈtrɛtʃərəsli/
adverb
  1. In a way that is dangerously unpredictable or unsafe.
    • Ice formed treacherously on the steps overnight.
    • The wind shifted treacherously, catching the sailor off guard.
    • The road curved treacherously close to the cliff edge.
  2. In a way that shows betrayal or disloyalty.
    • The general acted treacherously by opening the gates to the enemy.
    • She smiled at her friend while treacherously planning to take her job.
    • He treacherously revealed his partner's secrets to their rivals.
What does "treacherously" mean? | whatsthatwordmean | whatsthatwordmean