1. excessive or fanatical devotion to a cause, belief, or ideal

Examples

• His political zealotry alienated many of his former friends.
• The committee warned against religious zealotry in public schools.
• Her environmental zealotry sometimes made her difficult to work with.
• The movement was damaged by the zealotry of its most extreme members.
• Critics accused the group of zealotry rather than genuine reform.
• The professor’s academic zealotry impressed some students but intimidated others.