fanatism

/ˈfeɪnəˌtɪzəm/
noun
  1. Extreme, uncritical enthusiasm or devotion, especially in religion, politics, or a hobby.
    • His fanatism for the local soccer team led him to paint his entire house in team colors.
    • The fanatism of the crowd at the rally made it hard to have a calm conversation.
    • Religious fanatism can sometimes lead to conflict between different groups.
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