173 entries under persistent topic. ×
| bound(adjective, set, strong, tough, intense) | |
| intractable(adjective, tough, rigid, inflexible) | |
| mulish(adjective, mean, strong, hard, tough) | |
| contrary(adjective, determined, resolute, obstinate) | |
| pat(adjective, solid, determined, usual, steady) | |
| recalcitrant(adjective, tough, obstinate, stubborn) | |
| unhesitating(adjective, complete, certain, resolution, serious) | |
| committed(adjective, strong, determined, steady, fixed) | |
| contumacious(adjective, tough, obstinate, stubborn) | |
| never-failing(adjective, complete, total, solid, certain) | |
| continuous(adjective, complete, wild, steady, original) | |
| defiant(adjective, strong, bold, spirited) | |
| demanding(adjective, obstinate, insistent, dogged) | |
| hell-bent(adjective, determined, fixed, resolute) | |
| insubordinate(adjective, tough, obstinate, stubborn) | |
| inveterate(adjective, certain, familiar, usual, limited) | |
| invincible(adjective, obstinate, insistent, dogged) | |
| serious(adjective, strong, hard, tough, severe) | |
| true-blue(adjective, good, close, strong, correct) | |
| unmanageable(adjective, tough, obstinate, stubborn) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |