noun
excessive or fanatical devotion to a cause or belief
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The zealotry of the group led to extreme actions that caused harm to innocent people.
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His zealotry for the latest tech gadgets is unmatched by anyone I know.
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Don't listen to the zealotry of those fanboys, make your own decision.
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Her zealotry for justice burned like a fire within her, driving her to fight for what she believed in.