mischief in WordNet English dictionary

1. the quality or nature of being harmful or evil
   maleficence  mischief  balefulness 
   
2. reckless or malicious behavior that causes discomfort or annoyance in others
   mischief  mischief-making  mischievousness  deviltry  devilry  devilment  rascality  roguery  roguishness  shenanigan