Definition of "zealot" []

• One who is zealous, especially excessively so. (noun)
• A fanatically committed person. (noun)
• A member of a Jewish movement of the first century A.D. that fought against Roman rule in Palestine as incompatible with strict monotheism. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "At some level, a zealot is a zealot and love of a property can also lead to discussions online that could be interpreted as “spirited debate”, but usually come across more as “psychotic ravings mixed with threats of grisly murder.”"
• "GOI demostrates that a zealot is a zealot no matter what they claim as their ‘affiliation’."
• "However, as I said, this was not my business, and besides, I learned a long time ago that arguing with a zealot is like arguing with a brick wall: it doesn't matter what you say, it's going to remain the same as it was when you started, impassive and unchanged."