- Definitions|2
- Thesaurus|493
- Abbreviations|0
| peppy(adjective, strong, tough, fit, lively) | |
| perpetual(adjective, continuous) | |
| plugging(adjective, strong, firm, determined, active) | |
| purposeful | |
| repeated(adjective, continuous) | |
| ruthless(adjective, resolute) | |
| sprightly(adjective, strong, moving, lively, active) | |
| spunky(adjective, resolute, tenacious) | |
| stable | |
| strong-willed(adjective, resolute, tenacious) | |
| unchanging(adjective, continuous) | |
| uncompromising(adjective, resolute) | |
| unshakable | |
| unsleeping | |
| unstoppable | |
| zippy(adjective, strong, tough, fit, lively) | |
| adamant | |
| attention | |
| attentive | |
| ball of fire(expression, adjective, idiom, strong, lively) |
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| APA | Smart Define. (2015). indefatigable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/indefatigable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indefatigable thesaurus" https://smartdefine.org/indefatigable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, indefatigable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/indefatigable/thesaurus/synonyms>. |
| MLA | Smart Define. "indefatigable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/indefatigable/thesaurus/synonyms> |