- Definitions|2
- Thesaurus|493
- Abbreviations|0
| flat(adjective, continuous) | |
| flintlike(adjective, tenacious) | |
| forcible(adjective, strong, moving, lively, active) | |
| full of beans(expression, adjective, idiom, active, peppy) | |
| gapless(adjective, continuous) | |
| go-go(adjective, strong, firm, determined, steady) | |
| grind(adjective, strong, firm, energetic, determined) | |
| habitual(adjective, continuous) | |
| hale(strong, fit, healthy, well, robust) | |
| hardy(adjective, strong, tough, fit, lively) | |
| hell-bent(adjective, untiring) | |
| high-powered(adjective, strong, moving, lively, active) | |
| homogeneous(adjective, continuous) | |
| hyper | |
| inalterable | |
| intense | |
| intrepid | |
| invariable(adjective, continuous) | |
| iron-willed(adjective, resolute) | |
| ironclad(adjective, untiring) |
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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> |