104 entries under firm topic. ×
| uncompromising(adjective, tough, deliberate, determined) | |
| contumacious(adjective, tough, determined, obstinate) | |
| definite(adjective, strong, certain, unyielding) | |
| recalcitrant(adjective, tough, obstinate, stubborn) | |
| solid(adjective, strong, tough, certain) | |
| strong-minded(adjective, determined, fixed, serious) | |
| unbending(adjective, strong, tough, severe, flat) | |
| opinionated(adjective, tough, determined, unreasonable) | |
| pigheaded(adjective, tough, determined, unreasonable) | |
| plodding(adjective, strong, determined, steady) | |
| serious(adjective, strong, determined, bold) | |
| unwearied(adjective, strong, energetic, determined) | |
| intransigent(adjective, strong, tough, deliberate) | |
| unhesitating(adjective, determined, serious, resolute) | |
| cantankerous(adjective, tough, obstinate, stubborn) | |
| coherent(adjective, strong, tough, determined) | |
| cussed(adjective, tough, obstinate, stubborn) | |
| insubordinate(adjective, tough, obstinate, stubborn) | |
| perverse(adjective, tough, determined, unreasonable) | |
| plugging(adjective, strong, energetic, lively) |
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| APA | Smart Define. (2015). persistent thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/persistent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "persistent thesaurus" https://smartdefine.org/persistent/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, persistent thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/persistent/thesaurus/synonyms>. |
| MLA | Smart Define. "persistent thesaurus" 1 June 2015. Web. 21 September 2026. <https://smartdefine.org/persistent/thesaurus/synonyms> |