- Definitions|2
- Thesaurus|634
- Abbreviations|0
| indefatigable(adjective, strong, firm, determined, steady) | |
| indomitable(adjective, strong, firm, determined, steady) | |
| industrious person | |
| inexhaustible(adjective, strong, firm, determined, steady) | |
| inflammable | |
| inflammable material | |
| inspired(adjective, energetic, enthusiastic, determined, ardent) | |
| intense(adjective, keen, energetic, passionate, enthusiastic) | |
| intent(adjective, energetic, enthusiastic, determined, ardent) | |
| isooctane | |
| itchy(adjective, keen, passionate, enthusiastic, ardent) | |
| jet fuel | |
| jumping | |
| keen(adjective, smart, intense, energetic, passionate) | |
| kerosene | |
| know ins and outs(expression, idiom, decent, adequate, qualified) | |
| know the answers(expression, idiom, decent, adequate, qualified) | |
| know the ropes(expression, idiom, decent, adequate, qualified) | |
| know the score(expression, idiom, decent, adequate, qualified) | |
| knowing the ropes(expression, idiom, skilled, accomplished, talented) |
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| APA | Smart Define. (2016). fireball thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fireball/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "fireball thesaurus" https://smartdefine.org/fireball/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, fireball thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fireball/thesaurus/synonyms>. |
| MLA | Smart Define. "fireball thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/fireball/thesaurus/synonyms> |