| demoniac | |
| demonology | |
| denominational(adjective, sympathetic, interested, prejudiced, opinionated) | |
| devil | |
| devoted(adjective, keen, passionate, enthusiastic, sympathetic) | |
| devotionalist | |
| die-hard(noun, adjective) | |
| dingbat(noun, character, eccentric, ultraist) | |
| dogged | |
| donkey | |
| drug addict | |
| eager beaver | |
| energetic | |
| exclusive(adjective, sympathetic, interested, prejudiced, partisan) | |
| extreme enthusiast | |
| factional(adjective, sympathetic, exclusive, interested, prejudiced) | |
| fanatically | |
| fireball(adjective, keen, passionate, enthusiastic, ardent) | |
| fired(adjective, keen, passionate, enthusiastic, ardent) | |
| firm |
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| APA | Smart Define. (2015). fanatic thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/fanatic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fanatic thesaurus" https://smartdefine.org/fanatic/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, fanatic thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/fanatic/thesaurus/synonyms>. |
| MLA | Smart Define. "fanatic thesaurus" 24 December 2015. Web. 26 September 2026. <https://smartdefine.org/fanatic/thesaurus/synonyms> |