the.com/zealot

Someone who kept the faith after everyone else quietly lowered their expectations.

means A person who pursues a cause or belief with uncompromising, often excessive, fervor.

from From Greek 'zelos' (zeal, ardent devotion), via 'zelotes' (emulator, zealous follower). The capitalized Zealots were a 1st-century Jewish political movement fiercely resisting Roman rule in Judea — their militant devotion was so notorious that their name became the generic word for fanatical commitment, passing through Latin into English.

origin
from Greek zelos, meaning intense passion or jealousy
historical note
named for a 1st-century Jewish sect fighting Roman rule
modern usage
now applies to diets, sports teams, and operating systems
key trait
certainty unshaken by evidence, argument, or basic math
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