- Definitions|2
- Thesaurus|899
- Abbreviations|0
285 entries under adjective topic. ×
| hidebound(persistent, obstinate, stubborn, unbending) | |
| immovable(strong, hard, tough, difficult) | |
| implacable(set, strong, hard, tough) | |
| inalterable | |
| intent | |
| inviolable | |
| plodding(strong, firm, determined, steady) | |
| plugging(strong, firm, determined, steady) | |
| serious(strong, hard, tough, resolute) | |
| severe(strong, hard, tough, persistent) | |
| steely(set, strong, hard, tough) | |
| stoical(calm, cool, tolerant, enduring) | |
| thorough | |
| true(resolute, tenacious) | |
| unbending(strong, hard, tough, difficult) | |
| undiscouraged(bold, unconcerned, brave, steadfast) | |
| unfailing(strong, firm, determined, steady) | |
| unrelenting(set, strong, hard, tough) | |
| unremitting(strong, firm, determined, steady) | |
| unshakeable |
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| APA | Smart Define. (2015). indomitable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/indomitable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indomitable thesaurus" https://smartdefine.org/indomitable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, indomitable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/indomitable/thesaurus/synonyms>. |
| MLA | Smart Define. "indomitable thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/indomitable/thesaurus/synonyms> |