338 entries under strong topic. ×
| unrelenting(adjective, mean, hard, tough) | |
| adamant(adjective, mean, hard, secure) | |
| tough(adjective, calm, mean, clear) | |
| staunch(noun, adjective, calm, good, close) | |
| loyal(adjective, good, close, correct) | |
| obstinate(adjective, mean, hard, tough) | |
| tenacious(adjective, clear, sound, free) | |
| sturdy(adjective, calm, hard, sound) | |
| unfaltering(adjective, complete, total, solid) | |
| secure(verb, adjective, calm, fix) | |
| unflinching(adjective, certain, determined, steady) | |
| unswerving(adjective, close, tough, correct) | |
| sure(adjective, calm, good, close, clear) | |
| dogged(adjective, mean, hard, tough) | |
| established(adjective, definite, state, calm) | |
| reliable(adjective, calm, close, clear) | |
| adamantine(adjective, hard, tough, determined) | |
| certain(adjective, characteristic, good, change, clear) | |
| definite(adjective, good, clear, complete) | |
| faithful(adjective, good, close, correct) |
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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> |