A person who is fanatical and uncompromising in pursuit of their religious, political, or other ideals.

कट्टरपंथी

English Usage: The zealot refused to consider any argument that contradicted his beliefs.

Hindi Usage: कट्टरपंथी ने किसी भी ऐसे तर्क पर विचार करने से इनकार कर दिया जो उसकी मान्यताओं के विपरीत था।