- Definitions|2
- Thesaurus|493
- Abbreviations|0
255 entries under adjective topic. ×
| enthusiastic(determined, active, resolute, peppy) | |
| fervent | |
| hearty(strong, fit, healthy, well) | |
| inexorable | |
| lively(strong, moving, active, vigorous) | |
| obdurate | |
| plodding(activity, strong, firm, determined) | |
| plucky(resolute, tenacious) | |
| set | |
| tough(strong, sound, fit, firm) | |
| unbending | |
| unconquerable | |
| undying | |
| unshakeable | |
| vital(strong, tough, fit, lively) | |
| aggressive(strong, moving, lively, active) | |
| ambitious | |
| animated(strong, moving, lively, active) | |
| brisk(strong, moving, lively, active) | |
| careful |
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| APA | Smart Define. (2015). indefatigable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/indefatigable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indefatigable thesaurus" https://smartdefine.org/indefatigable/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, indefatigable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/indefatigable/thesaurus/synonyms>. |
| MLA | Smart Define. "indefatigable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/indefatigable/thesaurus/synonyms> |