153 entries under substantial topic. ×
| unshakable(adjective, strong, hard, secure, tough) | |
| well-made(adjective, strong, cool, great, sound) | |
| anchored(adjective, calm, strong, secure, firm) | |
| crowded(adjective, close, set, firm, heavy) | |
| deep(verb, adjective, set, sound, heavy) | |
| jam-packed(adjective, close, strong, short) | |
| substantive(adjective, physical, material, actual) | |
| unchangeable(adjective, calm, strong, secure, firm) | |
| appreciable | |
| big(adjective, person, body, strong, sound) | |
| congested(adjective, close, short, compact) | |
| factual(adjective, correct, reasonable, sensible, exact) | |
| gargantuan(adjective, big, heavy, large) | |
| hale(adjective, strong, sound, complete, tough) | |
| impermeable(adjective, close, set, hard, tough) | |
| natural(adjective, material, tangible) | |
| objective(adjective, physical, material, real) | |
| resolute(adjective, calm, strong, secure, tough) | |
| rooted(adjective, strong, hard, secure, steady) | |
| significant(adjective, extraordinary, proper, exceptional) |
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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> |