173 entries under persistent topic. ×
| enduring(adjective, calm, close, strong, sound) | |
| stout(adjective, calm, strong, sound, tough) | |
| permanent(adjective, calm, strong, secure, tough) | |
| unalterable(adjective, characteristic, calm, strong, hard) | |
| inexorable(adjective, mean, strong, hard, tough) | |
| obdurate(adjective, strong, hard, secure, tough) | |
| lasting(adjective, calm, strong, secure, tough) | |
| unwavering(adjective, calm, close, strong, secure) | |
| invariable(adjective, calm, strong, secure, strain) | |
| unshakable(adjective, mean, strong, hard, complete) | |
| solid(adjective, calm, good, close, set) | |
| perpetual(adjective, strain, determined, familiar, steady) | |
| stabile(adjective, calm, strong, secure, strain) | |
| sustained(adjective, strain, firmness, continuous) | |
| insistent(adjective, set, determined, steady, resolute) | |
| relentless(adjective, mean, strong, hard, tough) | |
| unrelenting(adjective, mean, strong, hard, tough) | |
| adamant(adjective, mean, strong, hard, secure) | |
| tough(adjective, calm, mean, clear, strong) | |
| staunch(noun, adjective, calm, good, close) |
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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> |