94 entries under tough topic. ×
| able(adjective, strong, sound, easy) | |
| bound(adjective, close, strong, firm) | |
| capable(adjective, strong, sound, fit) | |
| close-grained(adjective, close, set, hard) | |
| dogged(adjective, strong, firm, determined) | |
| energetic(adjective, strong, sound, heavy) | |
| impervious(adjective, set, hard, heavy) | |
| in fine feather(expression, adjective, idiom, strong, sound) | |
| persevering(adjective, strong, firm, determined) | |
| powerhouse(adjective, strong, fit, healthy) | |
| purposeful(adjective, strong, firm, determined) | |
| refractory(adjective, hard, firm, tense) | |
| stark(adjective, strong, hard, sound) | |
| strong-willed(adjective, strong, firm, determined) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |