- Definitions|2
- Thesaurus|493
- Abbreviations|0
| keen | |
| level(adjective, continuous) | |
| lusty(adjective, strong, sound, tough, fit) | |
| meticulous | |
| mettlesome | |
| monolithic(adjective, continuous) | |
| mulish | |
| muscular(strong, fit, healthy, well, robust) | |
| never-ending | |
| never-tiring | |
| never idle | |
| never tiring(expression, idiom, perseverance) | |
| nonstop(adjective, continuous) | |
| nose to grindstone(adjective, untiring) | |
| perennial(adjective, continuous) | |
| permanent | |
| pigheaded | |
| potent(adjective, strong, tough, fit, lively) | |
| pounding | |
| powerful(adjective, strong, sound, tough, fit) |
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| APA | Smart Define. (2015). indefatigable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/indefatigable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indefatigable thesaurus" https://smartdefine.org/indefatigable/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, indefatigable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/indefatigable/thesaurus/synonyms>. |
| MLA | Smart Define. "indefatigable thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/indefatigable/thesaurus/synonyms> |