fanatic

狂热爱好者、迷

My brother is a fitness fanatic who trains twice a day.

我哥是健身狂热爱好者，一天练两次。

狂热份子、偏执者贬义

A small group of fanatics tried to disrupt the ceremony.

一小群狂热份子试图破坏典礼。

狂热的、盲信的

He has a fanatic devotion to the team he supports.

他对自己支持的球队有著狂热的忠诚。