226 entries under solid topic. ×
| reserved(adjective, firm, shy, stable) | |
| rheumatic(adjective, hard, firm, stiff) | |
| robust(adjective, strong, sound, secure, tough) | |
| safe(adjective, clear, strong, hard, sound) | |
| safe and sound(expression, adjective, idiom, strong) | |
| sealed(verb, adjective, calm, quiet, smooth) | |
| sedate(adjective, firm, shy, stable) | |
| serene(adjective, calm, quiet, smooth, firm) | |
| sewed up(expression, adjective, set, certain) | |
| sinewy(adjective, strong, sound, tough) | |
| solid as a rock(expression, adjective, idiom, strong, firm) | |
| staid(adjective, set, firm, stable) | |
| stalwart(adjective, strong, sound, tough) | |
| starched(adjective, hard, firm, stiff) | |
| starchy(adjective, hard, firm, stiff) | |
| stiff as a board(expression, adjective, idiom, hard, firm) | |
| stout(adjective, strong, sound, tough) | |
| strapping(adjective, strong, sound, tough) | |
| stringent(adjective, set, severe, harsh) | |
| surefire(adjective, set, certain, definite) |
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| APA | Smart Define. (2016). fixed thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, fixed thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>. |
| MLA | Smart Define. "fixed thesaurus" 16 March 2016. Web. 21 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms> |