- Definitions|2
- Thesaurus|899
- Abbreviations|0
| gutsy(adjective, strong, tough, bold, spirited) | |
| hard-line(adjective, strong, hard, tough, difficult) | |
| hearty(adjective, resolute, tenacious) | |
| impenetrable | |
| incontestable | |
| lasting(adjective, persevering) | |
| loyal(adjective, resolute) | |
| obdurate(adjective, strong, hard, tough, difficult) | |
| solid(adjective, perseverance) | |
| spunky(adjective, strong, bold, resolute, spirited) | |
| stern(adjective, resolute, persistent, obstinate, insistent) | |
| strict(adjective, strong, hard, tough, resolute) | |
| unchangeable(adjective, hard, resolute, rigid, inflexible) | |
| undefeatable(adjective, steadfast, unyielding) | |
| undefeated | |
| vigorous(adjective, strong, powerful, determined, noble) | |
| adamant(adjective, strong, hard, tough, determined) | |
| assiduous | |
| audacious(strong, tough, bold, spirited, brave) | |
| bulldogged(adjective, tenacious) |
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| APA | Smart Define. (2015). indomitable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/indomitable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indomitable thesaurus" https://smartdefine.org/indomitable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, indomitable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/indomitable/thesaurus/synonyms>. |
| MLA | Smart Define. "indomitable thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/indomitable/thesaurus/synonyms> |