| faithful | |
| fanatic(adjective, keen, passionate, enthusiastic, ardent) | |
| fanatical(adjective, keen, passionate, enthusiastic, excited) | |
| fireball(adjective, keen, passionate, enthusiastic, ardent) | |
| flagrant | |
| flashing(adjective, hot, white, glowing, fiery) | |
| frenetic(adjective, keen, passionate, enthusiastic, ardent) | |
| frisky(adjective, vigorous) | |
| full-blooded(adjective, vigorous) | |
| fuming | |
| gleaming(adjective, hot, white, glowing, fiery) | |
| gung-ho(adjective, keen, passionate, enthusiastic, ardent) | |
| guttering | |
| hot-headed(adjective, intense, violent, hot, fierce) | |
| igneous(adjective, intense, violent, hot, fierce) | |
| ignescent | |
| illuminated(adjective, hot, white, glowing, fiery) | |
| in earnest | |
| industrious(adjective, vigorous) | |
| intensely interested |
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| APA | Smart Define. (2015). afire thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/afire/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "afire thesaurus" https://smartdefine.org/afire/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, afire thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/afire/thesaurus/synonyms>. |
| MLA | Smart Define. "afire thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/afire/thesaurus/synonyms> |