71 entries under tough topic. ×
| true(adjective, strong, flat, firm) | |
| uncompromising(adjective, firm, deliberate, determined) | |
| contumacious(adjective, firm, determined, obstinate) | |
| recalcitrant(adjective, firm, obstinate, stubborn) | |
| solid(adjective, strong, firm, certain) | |
| unbending(adjective, strong, severe, flat) | |
| dependable(adjective, strong, certain, regular) | |
| hardy(determined, resolute, sturdy, hard-wearing) | |
| opinionated(adjective, firm, determined, unreasonable) | |
| pigheaded(adjective, firm, determined, unreasonable) | |
| reliable(adjective, strong, honest, certain) | |
| intransigent(adjective, strong, firm, deliberate) | |
| cantankerous(adjective, firm, obstinate, stubborn) | |
| coherent(adjective, strong, firm, determined) | |
| cussed(adjective, firm, obstinate, stubborn) | |
| indestructible(adjective, stable, moral, sturdy) | |
| insubordinate(adjective, firm, obstinate, stubborn) | |
| perduring(stable, sturdy, constant, enduring) | |
| perverse(adjective, firm, determined, unreasonable) | |
| rebellious(adjective, firm, unreasonable, grim) |
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| APA | Smart Define. (2015). persistent thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/persistent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "persistent thesaurus" https://smartdefine.org/persistent/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, persistent thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/persistent/thesaurus/synonyms>. |
| MLA | Smart Define. "persistent thesaurus" 1 June 2015. Web. 24 September 2026. <https://smartdefine.org/persistent/thesaurus/synonyms> |