182 entries under firm topic. ×
| brawny(adjective, person, body, strong, tough) | |
| changeless(adjective, severe, harsh, stable) | |
| compacted(adjective, set, strong, hard) | |
| crowded(adjective, close, set, heavy) | |
| jelled(adjective, set, hard, tough) | |
| persistent(adjective, strong, tough, certain) | |
| resistant(adjective, strong, hard, tough, fit) | |
| stony(adjective, hard, stiff, rigid) | |
| unbending(adjective, hard, stiff, tense) | |
| unbreakable(adjective, strong, hard, tough, severe) | |
| unchangeable(adjective, calm, strong, secure) | |
| adamantine(adjective, set, strong, hard, severe) | |
| callous(adjective, set, strong, hard) | |
| congealed(adjective, set, hard, tough) | |
| frozen(adjective, hard, stiff, tense) | |
| hale(adjective, strong, sound, complete, tough) | |
| resolute(adjective, calm, strong, secure, tough) | |
| steely(adjective, hard, stiff, tense) | |
| stubborn(adjective, strong, secure, tough) | |
| unchanging(adjective, severe, harsh, certain) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |