fanaticism
US /fəˈnæt̬.ɪ.sɪ.zəm/
UK /fəˈnæt̬.ɪ.sɪ.zəm/

1.
the quality or state of being fanatic
:
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Religious fanaticism can lead to extreme actions.
•
His fanaticism for the team was evident in his passionate cheering.
the quality or state of being fanatic