- Definitions|2
- Thesaurus|899
- Abbreviations|0
285 entries under adjective topic. ×
| pertinacious(strong, tough, firm, difficult) | |
| rigid(strong, hard, tough, persistent) | |
| set(hard, resolute, persistent, obstinate) | |
| single-minded(hard, resolute, persistent, obstinate) | |
| strong-minded(determined, resolution, fixed, courage) | |
| strong-willed(vigorous, noble, resolution, resolute) | |
| uncompromising(hard, tough, difficult, resolute) | |
| unswerving(strong, firm, determined, steady) | |
| unwearied(strong, firm, determined, steady) | |
| bullheaded(strong, hard, tough, difficult) | |
| continuing(strong, firm, determined, steady) | |
| decisive(resolute, tenacious) | |
| devoted(strong, firm, determined, steady) | |
| doughty(strong, powerful, bold, courage) | |
| gritty(strong, tough, noble, resolution) | |
| gutsy(strong, tough, bold, spirited) | |
| hard-line(strong, hard, tough, difficult) | |
| hearty(resolute, tenacious) | |
| impenetrable | |
| lasting |
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| APA | Smart Define. (2015). indomitable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/indomitable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indomitable thesaurus" https://smartdefine.org/indomitable/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, indomitable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/indomitable/thesaurus/synonyms>. |
| MLA | Smart Define. "indomitable thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/indomitable/thesaurus/synonyms> |