116 entries under substantial topic. ×
| resolute(adjective, calm, strong, secure, easy) | |
| sinewy(adjective, strong, tough, fit, solid) | |
| tenacious(adjective, strong, secure, tough, fit) | |
| thick(adjective, strong, hard, compact) | |
| unwavering(adjective, calm, strong, secure, firm) | |
| abiding(adjective, calm, strong, secure, tough) | |
| bolted(strong, secure, fast, short) | |
| brick-wall(adjective, calm, strong, secure, firm) | |
| calm(adjective, strong, secure, reasonable, firm) | |
| capable(adjective, strong, direct, tough, fit) | |
| close(adjective, strong, hard, firm, true) | |
| closed(strong, secure, stable, unmoving) | |
| compacted(adjective, strong, hard, sturdy) | |
| consolidated(adjective, strong, hard, complete, total) | |
| deep-rooted(adjective, calm, strong, solid, steady) | |
| dimensional(adjective, strong, hard, sturdy) | |
| equable(adjective, calm, strong, secure, firm) | |
| fixed resistant(expression, calm, strong, solid) | |
| hard as nails(expression, adjective, idiom, strong, tough) | |
| heavy-duty(adjective, strong, tough, solid, heavy) |
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| APA | Smart Define. (2016). sound thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/sound/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "sound thesaurus" https://smartdefine.org/sound/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, sound thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/sound/thesaurus/synonyms>. |
| MLA | Smart Define. "sound thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/sound/thesaurus/synonyms> |