fanatic
noun [ C ] uk/fəˈnæt.ɪk/ us/fəˈnæt̬.ɪk/
C2 informal入迷者
a person who is extremely interested in something, to a degree that some people find unreasonable
a fitness/film fanatic 健身／电影迷
disapproving狂热者，极端分子
a person who has very extreme beliefs that may lead them to behave in unreasonable or violent ways
religious fanatics 宗教狂热分子