891 entries under adjective topic. ×
| rock-solid(hard, strain, firmness, compact) | |
| relentless(mean, strong, hard, tough) | |
| unrelenting(mean, strong, hard, tough) | |
| adamant(mean, strong, hard, secure) | |
| tough(calm, mean, clear, strong) | |
| staunch(noun, calm, good, close) | |
| loyal(good, close, strong, correct) | |
| obstinate(mean, strong, hard, tough) | |
| resolved(set, severe, harsh, certain) | |
| tenacious(clear, strong, sound, free) | |
| sturdy(calm, strong, hard, sound) | |
| unfaltering(strong, complete, total, solid) | |
| secure(verb, calm, fix, strong) | |
| unflinching(strong, certain, determined, steady) | |
| unswerving(close, strong, tough, correct) | |
| sure(calm, good, close, clear) | |
| decided(set, clear, intense, certain) | |
| dogged(mean, strong, hard, tough) | |
| established(definite, strong, state, calm) | |
| unbendable(determined, unreasonable, resolute, rigid) |
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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> |