deviltry

1. We judged they was studying up some kind of worse deviltry than ever.
   我们断定，他们这是正在策划什么比往常更加恶毒的主意。
2. The creations of a small coterie of malicious hackers who invent toxic software for the sheer deviltry of it.
   计算机病毒系一小撮存心不良的黑客所为，这些人纯属为了搞恶作剧而编造有毒软件。

noun

1. reckless or malicious behavior that causes discomfort or annoyance in others

   Synonym:    mischiefmischief-makingmischievousnessdevilrydevilmentrascalityrogueryroguishnessshenanigan

2. wicked and cruel behavior

   Synonym:    devilry