233 entries under solid topic. ×
| unvarying(adjective, calm, clear, strong, secure) | |
| bound(verb, adjective, control, check, strong) | |
| coagulated(verb, adjective, heavy, deep) | |
| dedicated(adjective, firm, determined, steady) | |
| enduring(adjective, calm, strong, secure, flat) | |
| indubitable(adjective, clear, firm, certain) | |
| iron(adjective, strong, tough, firm) | |
| irrefutable(adjective, clear, sound, firm) | |
| nailed(verb, adjective, calm, strong, secure) | |
| on ice(expression, adjective, clear, firm) | |
| ossified(adjective, hard, firm, heavy) | |
| refractory(adjective, hard, tough, firm) | |
| reliable(adjective, calm, clear, strong, secure) | |
| riveted(verb, adjective, strong, settle, establish) | |
| stony(adjective, hard, firm, stiff) | |
| strong(adjective, calm, hard, tough, flat) | |
| substantial(adjective, calm, strong, hard, secure) | |
| undeviating(adjective, strong, severe, flat, firm) | |
| undoubted(adjective, clear, sound, firm) | |
| unfaltering(adjective, firm, certain, steady) |
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| APA | Smart Define. (2016). set thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/set/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "set thesaurus" https://smartdefine.org/set/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, set thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/set/thesaurus/synonyms>. |
| MLA | Smart Define. "set thesaurus" 1 March 2016. Web. 20 September 2026. <https://smartdefine.org/set/thesaurus/synonyms> |