182 entries under firm topic. ×
| ossified(adjective, set, hard, heavy) | |
| petrified(adjective, set, strong, hard) | |
| set in stone(expression, adjective, idiom, calm, set) | |
| taut(adjective, strong, hard, substantial) | |
| tenacious(adjective, strong, sound, secure, tough) | |
| tense(adjective, hard, stiff, rigid) | |
| thickened(adjective, set, hard, heavy) | |
| unbendable(adjective, rigid, inflexible, unbending) | |
| unfaltering(adjective, steady, stable, fixed) | |
| unflappable(certain, steady, sure, guaranteed) | |
| unqualified(adjective, excellent, marvelous, wicked) | |
| able(adjective, strong, sound, tough, easy) | |
| annealed(adjective, hard, stiff, tense) | |
| arthritic(adjective, hard, stiff, tense) | |
| benumbed(adjective, hard, stiff, tense) | |
| bound(adjective, close, strong, tough) | |
| brick-wall(adjective, calm, strong, fast) | |
| buckram(adjective, hard, stiff, tense) | |
| calm(adjective, strong, fast, steady) | |
| capable(adjective, strong, sound, tough, fit) |
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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> |