203 entries under solid topic. ×
| abiding(adjective, calm, strong, secure, tough) | |
| ardent(adjective, firm, enthusiastic, true) | |
| brick-wall(adjective, calm, strong, secure, firm) | |
| brick wall(expression, adjective, calm, strong, hard) | |
| calm(adjective, strong, secure, reasonable, firm) | |
| candid(strong, honest, true, steady) | |
| capable(adjective, strong, direct, tough, fit) | |
| conclusive(clear, strong, reasonable, certain) | |
| decisive(strong, important, powerful, alert) | |
| deep-rooted(adjective, calm, strong, steady) | |
| definite(clear, strong, certain, steady) | |
| determinative(reasonable, honest, rational, convincing) | |
| determined(clear, strong, certain, definite) | |
| devoted(adjective, strong, honest, true) | |
| equable(adjective, calm, strong, secure, firm) | |
| fixed resistant(expression, calm, strong, substantial) | |
| fortified(adjective, strong, firm, true) | |
| generous(adjective, strong, big, important) | |
| hard as nails(expression, adjective, idiom, strong, tough) | |
| heavy-duty(adjective, strong, tough, heavy) |
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| APA | Smart Define. (2016). sound thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sound/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "sound thesaurus" https://smartdefine.org/sound/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, sound thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sound/thesaurus/synonyms>. |
| MLA | Smart Define. "sound thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/sound/thesaurus/synonyms> |