275 entries under solid topic. ×
| impermeable(adjective, close, hard, fast) | |
| incompliant(adjective, tough, determined, stiff) | |
| never-failing(adjective, complete, total, certain) | |
| petrified(adjective, calm, set, strong, hard) | |
| solidified(adjective, set, hard, heavy) | |
| trustworthy(adjective, good, close, clear, strong) | |
| unfailing(adjective, good, set, clear, strong) | |
| cemented(adjective, set, strong, hard, secure) | |
| compacted(adjective, set, strong, hard) | |
| congealed(adjective, set, hard, heavy) | |
| healthy(adjective, strong, sound, complete, tough) | |
| hearty(adjective, strong, sound, complete, tough) | |
| jelled(adjective, set, hard, heavy) | |
| nonporous(adjective, hard, rigid, inflexible) | |
| packed(adjective, close, set, strong, hard) | |
| physical(adjective, strong, hard, material) | |
| true-blue(adjective, good, close, strong, correct) | |
| unquestioning(adjective, set, clear, certain) | |
| well-constructed(complete, vigorous, sturdy) | |
| allegiant(adjective, close, correct, continue, honest) |
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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> |