psychopath /ˈsaɪkəʊˌpæθ/

• 1. 

  N-COUNT A psychopath is someone who has serious mental problems and who may act in a violent way without feeling sorry for what they have done. 精神变态者

  例：

  She was abducted by a dangerous psychopath.

  她被一名危险的精神变态者劫持了。