275 entries under solid topic. ×
| sturdy(adjective, calm, strong, hard, sound) | |
| unfaltering(adjective, strong, complete, total) | |
| secure(verb, adjective, calm, fix, strong) | |
| unswerving(adjective, close, strong, tough, correct) | |
| sure(adjective, calm, good, close, clear) | |
| dogged(adjective, mean, strong, hard, tough) | |
| established(adjective, definite, strong, state, calm) | |
| reliable(adjective, calm, close, clear, strong) | |
| certain(adjective, characteristic, good, change, clear) | |
| definite(adjective, good, clear, strong, complete) | |
| faithful(adjective, good, close, strong, correct) | |
| dense(adjective, set, strong, hard, tough) | |
| unchanging(adjective, close, correct, moderate, severe) | |
| devoted(adjective, good, close, strong, correct) | |
| positive(adjective, good, clear, strong, complete) | |
| true(adjective, good, close, clear, strong) | |
| unchangeable(adjective, calm, strong, secure, moderate) | |
| compact(verb, adjective, close, set, fix) | |
| concrete(verb, adjective, close, set, clear) | |
| dependable(adjective, good, close, strong, tough) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |