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Zealotry
Negative Nuance
Zealotry implies excessive zeal and can be viewed negatively as blind passion or intolerance. 
Strong Commitment
Use 'zealotry' to describe someone with extreme commitment to a cause, often going beyond what is considered reasonable. 
Not Always Positive
While 'zealotry' involves passion, it isn't always positive and often suggests a stubborn or single-minded approach. 