275 entries under solid topic. ×
| able(adjective, strong, sound, tough, easy) | |
| annealed(adjective, hard, stiff, rigid) | |
| ardent(adjective, close, correct, honest) | |
| arthritic(adjective, hard, stiff, rigid) | |
| athletic(strong, sound, tough, fit) | |
| benumbed(adjective, hard, stiff, rigid) | |
| brick-wall(adjective, calm, strong, secure) | |
| buckram(adjective, hard, stiff, rigid) | |
| caked(adjective, close, set, fix) | |
| calcified(adjective, close, set, contract) | |
| capable(adjective, strong, sound, tough, fit) | |
| careful(adjective, good, strong, honest) | |
| chilled(adjective, hard, stiff, rigid) | |
| circumscribed(adjective, close, certain, short) | |
| clabbered(adjective, set, heavy, deep) | |
| clotted(adjective, set, heavy, deep) | |
| coagulated(adjective, set, heavy, deep) | |
| complete(adjective, clear, total, certain) | |
| conglomerated(adjective, set, hardened, syrupy) | |
| conscientious(adjective, good, close, strong, correct) |
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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> |