fanaticism

US /fəˈnæt̬.ɪ.sɪ.zəm/
UK /fəˈnæt̬.ɪ.sɪ.zəm/
"fanaticism" picture
1.

the quality or state of being fanatic

:
Religious fanaticism can lead to extreme actions.
His fanaticism for the team was evident in his passionate cheering.