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Adverb: mischievously  mis-chu-vus-lee or ,mis'chee-vee-us-lee
  1. In a playfully troublesome or teasing way
    "he mischievously looked for a chance to embarrass his sister";
    - naughtily
     
  2. In a way intended to cause harm or trouble
    "He mischievously spread rumours about his colleagues";
    - maliciously