136 entries under firm topic. ×
| well-founded(adjective, strong, sound, secure, tough) | |
| cool(adjective, calm, quiet, sound, reasonable) | |
| dense(adjective, close, strong, hard) | |
| imperturbable(adjective, calm, smooth, solid) | |
| sober(adjective, calm, quiet, sound, reasonable) | |
| unfaltering(adjective, solid, steady, regular) | |
| unmoved(adjective, calm, still, lifeless) | |
| well-built(adjective, strong, sound, tough) | |
| fastened(adjective, strong, secure, solid) | |
| potent(adjective, strong, sound, tough) | |
| serene(adjective, calm, quiet, smooth, soft) | |
| single-minded(adjective, solid, fixed, resolute) | |
| steady-going(adjective, continue, solid, steady) | |
| together(adjective, calm, sound, reasonable) | |
| attached(adjective, secure, true, fixed) | |
| bound(adjective, close, strong, flat) | |
| close(adjective, strong, hard, true) | |
| compact(adjective, close, strong, hard) | |
| constrained(true, fixed, constant, steadfast) | |
| firmly |
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| APA | Smart Define. (2015). stable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/stable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, stable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>. |
| MLA | Smart Define. "stable thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms> |