185 entries under strong topic. ×
| tenacious(adjective, sound, secure, tough) | |
| undeviating(adjective, quiet, direct, smooth) | |
| vigorous(adjective, sound, complete, tough) | |
| well-founded(adjective, sound, secure, tough) | |
| dense(adjective, close, hard, firm) | |
| formidable | |
| hale(adjective, sound, complete, tough) | |
| predictable(adjective, good, honest, solid) | |
| vital(adjective, complete, solid, vigorous) | |
| well-built(adjective, sound, tough, firm) | |
| able-bodied(adjective, sound, tough, solid) | |
| concrete(adjective, hard, solid, physical) | |
| energetic(adjective, sound, tough, solid) | |
| fastened(adjective, secure, firm, solid) | |
| husky(adjective, hard, substantial, sturdy) | |
| mighty(adjective, sound, tough, solid) | |
| muscular(adjective, sound, tough, solid) | |
| persevering(adjective, flat, determined, definite) | |
| potent(adjective, sound, tough, firm) | |
| resolved(adjective, flat, determined, thoughtful) |
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| APA | Smart Define. (2015). stable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/stable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, stable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>. |
| MLA | Smart Define. "stable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms> |