nutcase /ˈnʌtˌkeɪs/ (also nut case)

• 1. 

  N-COUNT If you refer to someone as a nutcase, you mean that they are mad or that their behaviour is very strange. 疯子 [非正式]

  例：

  The woman's a nutcase. She needs to be locked up.

  那个女的是个疯子。她需要被关起来。