deviltry deviltry /ˈdɛvəltri/

noun

1. Reckless or malicious behavior that causes discomfort or annoyance in others  ( devilry , deviltry , mischief-making , devilment , mischievousness , rascality , roguery , roguishness , shenanigan , mischief )
   reckless or malicious behavior that causes discomfort or annoyance in others
     The mischievous child played pranks on his siblings.
   The mischievous child played pranks on his siblings.
   
2. Wicked and cruel behavior  ( devilry , deviltry )
   wicked and cruel behavior