200 entries under solid topic. ×
| set in stone(expression, adjective, idiom, secure, firm) | |
| staid(adjective, firm, thoughtful, fixed) | |
| stubborn(adjective, secure, firm, steady) | |
| tried(good, strong, true, reliable) | |
| able(adjective, strong, sound, tough, easy) | |
| active(adjective, strong, sound, tough) | |
| ardent(adjective, firm, true, fixed) | |
| athletic(adjective, strong, sound, tough) | |
| big(adjective, strong, sound, tough) | |
| brick-wall(adjective, firm, steady, fixed) | |
| buttoned down(expression, adjective, strong, safe) | |
| candid(adjective, good, strong, reasonable, honest) | |
| capable(adjective, strong, sound, tough) | |
| closed(adjective, calm, quiet, strong, secure) | |
| definite(adjective, good, strong, easy, flat) | |
| fit(adjective, sound, complete, vigorous) | |
| flawless(complete, clean, pure, vigorous) | |
| forceful(adjective, strong, sound, tough) | |
| forcible(adjective, strong, sound, tough) | |
| fortified(adjective, strong, firm, true) |
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| APA | Smart Define. (2015). stable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, stable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>. |
| MLA | Smart Define. "stable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms> |