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Adjective: mischievous  mis-chu-vus or ,mis'chee-vee-us
  1. Naughtily or annoyingly playful
    "teasing and worrying with mischievous laughter";
    - arch, impish, implike, pixilated, prankish, puckish, wicked [informal], scampish [rare], pixillated
  2. Deliberately causing harm or damage
    "mischievous rumours and falsehoods"

See also: harmful, ludic [formal], playful

Encyclopedia: Mischievous