166 entries under definite topic. ×
| obdurate(adjective, strong, hard, secure, tough) | |
| unwavering(adjective, calm, close, strong, secure) | |
| unshakable(adjective, mean, strong, hard, complete) | |
| solid(adjective, calm, good, close, set) | |
| adamant(adjective, mean, strong, hard, secure) | |
| staunch(noun, adjective, calm, good, close) | |
| resolved(adjective, set, severe, harsh, certain) | |
| tenacious(adjective, clear, strong, sound, free) | |
| unfaltering(adjective, strong, complete, total, solid) | |
| secure(verb, adjective, calm, fix, strong) | |
| unflinching(adjective, strong, certain, determined, steady) | |
| sure(adjective, calm, good, close, clear) | |
| decided(adjective, set, clear, intense, certain) | |
| established(adjective, strong, state, calm) | |
| reliable(adjective, calm, close, clear, strong) | |
| certain(adjective, characteristic, good, change, clear) | |
| strict(adjective, close, strong, hard, tough) | |
| unchanging(adjective, close, correct, moderate, severe) | |
| intent(adjective, set, intense, certain, deliberate) | |
| persevering(adjective, strong, tough, certain, determined) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |