fanaticism

/fəˈnætɪsɪzəm/
noun
  1. Extreme and often uncritical enthusiasm or devotion to a cause, belief, or activity, especially in religion or politics.
    • The leader's fanaticism inspired his followers to make great sacrifices.
    • Fanaticism can lead people to ignore facts and reason.
    • The team's fanaticism was evident in the way they painted their faces and cheered for hours.
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