182 entries under firm topic. ×
| persevering(adjective, strong, tough, determined) | |
| poised(adjective, calm, strong, certain) | |
| purposeful(adjective, strong, tough, determined) | |
| refractory(adjective, hard, tough, tense) | |
| rheumatic(adjective, hard, stiff, tense) | |
| rock-hard(adjective, hard, compact, dense) | |
| single-minded(adjective, steady, stable, fixed) | |
| situated(adjective, secure, steady, stiff) | |
| solid as a rock(expression, adjective, idiom, calm, strong) | |
| stabile(adjective, calm, strong, fast) | |
| starched(adjective, hard, stiff, tense) | |
| starchy(adjective, hard, sober, serious) | |
| stark(adjective, strong, hard, sound, tough) | |
| stiff as a board(expression, adjective, idiom, hard) | |
| strong-willed(adjective, strong, tough, determined) | |
| together(adjective, calm, strong, perfect) | |
| unflagging(strong, complete, fit, certain) | |
| unflexible(adjective, hard, stiff, tense) | |
| unfluctuating(adjective, calm, strong, fast) | |
| ungraceful(adjective, hard, stiff, tense) |
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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> |