71 entries under tough topic. ×
| staunch(adjective, strong, flat, firm) | |
| fixed(adjective, strong, flat, firm) | |
| unswerving(adjective, strong, firm, determined) | |
| inflexible(adjective, strong, flat, firm) | |
| obdurate(adjective, strong, flat, firm) | |
| abiding(adjective, strong, continue, flat) | |
| persisting(adjective, strong, firm, determined) | |
| single-minded(adjective, intense, deliberate, determined) | |
| set(adjective, strong, flat, firm) | |
| long-lasting(adjective, continue, sturdy, constant) | |
| strong-willed(adjective, strong, firm, intense) | |
| adamant(adjective, strong, flat, firm) | |
| inexorable(adjective, determined, unreasonable, grim) | |
| purposeful(adjective, strong, firm, deliberate) | |
| unshakable(adjective, strong, firm, determined) | |
| bound(adjective, strong, flat, firm) | |
| bullheaded(adjective, firm, determined, unreasonable) | |
| headstrong(adjective, firm, determined, unreasonable) | |
| intractable(adjective, firm, determined, obstinate) | |
| mulish(adjective, firm, determined, resolute) |
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| APA | Smart Define. (2015). persistent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/persistent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "persistent thesaurus" https://smartdefine.org/persistent/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, persistent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/persistent/thesaurus/synonyms>. |
| MLA | Smart Define. "persistent thesaurus" 1 June 2015. Web. 22 September 2026. <https://smartdefine.org/persistent/thesaurus/synonyms> |