DictionaryfanaticExtreme devotion
noun / adjective

fanatic

fuh-NAT-ik/fʌnˈætɪk/

A person with extreme, unquestioning devotion to a cause or interest, or showing such devotion.

The fanatic burns books while refusing to reconsider a harmless nature volume.

An anti-book fanatic feeds an indiscriminate book-burning fire while fervently displaying the campaign emblem and refusing to look at a harmless illustrated nature book offered for reconsideration.
Etymology

Originally “pertaining to a temple,” Latin fanaticus came to mean divinely inspired or mad. That association with overwhelming religious enthusiasm broadened into excessive, uncritical devotion to a cause.

In context

Allellu227:16
Leutzenring, a hot-headed fanatic who had spied Jesuits in every corner, and set Nicolae on his journey
Proofs of a Conspiracy [Part 1 of 2] by John Robison | Full Audiobook, Read-Along

More examples

  • As a fitness fanatic, she never misses a daily workout.
  • His fanatic loyalty to the leader leaves no room for doubt.
  • The fanatics dismiss any evidence that challenges their cause.

Forms

fanatic · fanatics

fanaticism noun — Extreme, unquestioning devotion to a cause.

fanatical adjective — Showing extreme, unquestioning enthusiasm or devotion.

Similar words

zealot
Especially suggests uncompromising devotion to a religious or political cause.
enthusiast
Expresses strong interest without necessarily implying excess or unquestioning devotion.