153 entries under substantial topic. ×
| forcible(adjective, clear, strong, sound, tough) | |
| heavy-duty(adjective, strong, sound, tough, heavy) | |
| lasting(calm, strong, certain, steady) | |
| petrified(adjective, set, strong, hard, firm) | |
| reinforced(adjective, strong, sound, tough, heavy) | |
| set in stone(expression, adjective, idiom, calm, set) | |
| sinewy(adjective, strong, hard, sound, tough) | |
| taut(adjective, strong, hard, firm) | |
| tenacious(adjective, strong, sound, secure, tough) | |
| touchable(adjective, material, palpable, tangible) | |
| visible(adjective, material, real, palpable) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| able(adjective, strong, sound, tough, easy) | |
| brick-wall(adjective, calm, strong, firm, fast) | |
| calm(adjective, strong, firm, fast, steady) | |
| capable(adjective, strong, sound, tough, fit) | |
| cemented(adjective, set, strong, hard, firm) | |
| close-grained(adjective, close, set, hard, tough) | |
| elephantine(adjective, big, heavy, round) | |
| energetic(adjective, strong, sound, tough, heavy) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |