153 entries under substantial topic. ×
| strapping(adjective, person, body, strong, sound) | |
| unchanging(adjective, severe, firm, harsh, certain) | |
| unvarying(adjective, calm, strong, firm, fast) | |
| able-bodied(adjective, person, body, strong, sound) | |
| athletic(adjective, person, body, strong, sound) | |
| considerable(adjective, important, powerful, significant) | |
| enduring(adjective, calm, strong, sound, tough) | |
| fastened(adjective, strong, stable, sure) | |
| meaningful(adjective, clear, strong, big, important) | |
| ponderable(adjective, material, tangible) | |
| settled(adjective, strong, secure, easy, firm) | |
| sincere(adjective, good, strong, reasonable, honest) | |
| abiding(adjective, calm, strong, firm, certain) | |
| active(adjective, strong, sound, tough, heavy) | |
| balanced(adjective, calm, strong, easy, firm) | |
| brick wall(expression, adjective, calm, strong, hard) | |
| closed(adjective, strong, stable, unmoving) | |
| deep-rooted(adjective, calm, strong, steady) | |
| even(verb, adjective, calm, strong, sound) | |
| existing(adjective, physical, material, true) |
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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> |