104 entries under firm topic. ×
| unchanging(adjective, certain, steady, stable) | |
| faithful(adjective, strong, certain, steady) | |
| indomitable(adjective, strong, determined, steady) | |
| tough(adjective, unreasonable, grim, resolute) | |
| decided(adjective, intense, deliberate, determined) | |
| strong-willed(adjective, strong, tough, intense) | |
| adamant(adjective, strong, tough, flat) | |
| continued(adjective, strong, determined, steady) | |
| dedicated(adjective, strong, determined, steady) | |
| demanding(adjective, obstinate, insistent, dogged) | |
| patient(noun, adjective, strong, energetic) | |
| purposeful(adjective, strong, tough, deliberate) | |
| unshakable(adjective, strong, tough, determined) | |
| bound(adjective, strong, tough, flat) | |
| bullheaded(adjective, tough, determined, unreasonable) | |
| courageous(adjective, determined, resolute, unyielding) | |
| headstrong(adjective, tough, determined, unreasonable) | |
| intractable(adjective, tough, determined, obstinate) | |
| mulish(adjective, tough, determined, resolute) | |
| true(adjective, strong, tough, flat) |
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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> |