176 entries under solid topic. ×
| clear-cut(adjective, set, firm, certain) | |
| clinched(adjective, set, certain, sure) | |
| confirmed(adjective, set, certain, sure) | |
| deep-rooted(calm, strong, steady, substantial) | |
| energetic(adjective, strong, sound, tough) | |
| ethical(open, honest, reliable, accurate) | |
| even(adjective, calm, strong, firm) | |
| fixed resistant(expression, calm, strong, substantial) | |
| forcible(adjective, strong, sound, tough) | |
| hale(adjective, strong, sound, tough) | |
| hard as nails(expression, adjective, idiom, strong, sound) | |
| hardy(adjective, strong, sound, tough) | |
| hearty(adjective, strong, sound, tough) | |
| heavy(adjective, strong, hard, sound, tough) | |
| heavy-duty(adjective, strong, sound, tough) | |
| hefty(adjective, strong, hard, substantial) | |
| husky(adjective, strong, hard, substantial) | |
| in fine feather(expression, adjective, idiom, strong, sound) | |
| indubitable(adjective, firm, certain, sure) | |
| irrefutable(adjective, sound, firm, certain) |
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| APA | Smart Define. (2015). secure thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/secure/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "secure thesaurus" https://smartdefine.org/secure/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, secure thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/secure/thesaurus/synonyms>. |
| MLA | Smart Define. "secure thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/secure/thesaurus/synonyms> |