- Definitions|2
- Thesaurus|5k
- Abbreviations|0
80 entries under firm topic. ×
| reliable(adjective, calm, strong, secure, tough) | |
| secure(adjective, calm, quiet, strong, hard) | |
| stalwart(adjective, calm, strong, sound, secure) | |
| sure(adjective, calm, strong, secure, continue) | |
| well-founded(adjective, calm, good, strong, sound) | |
| staunch(adjective, calm, strong, sound, secure) | |
| hale(adjective, strong, sound, complete, tough) | |
| sober(adjective, solid, big, heavy) | |
| tenacious(adjective, strong, sound, tough, fit) | |
| fixed(adjective, strong, hard, sound, tough) | |
| resolute(adjective, calm, strong, secure) | |
| set(adjective, calm, strong, hard, secure) | |
| able(adjective, strong, sound, tough, fit) | |
| balanced(adjective, calm, strong, secure) | |
| certain(adjective, solid, physical, material) | |
| cool(adjective, calm, solid, informal) | |
| imperturbable(adjective, solid, stable, fixed) | |
| intense(adjective, solid, enthusiastic, vigorous) | |
| mighty(adjective, strong, sound, tough, fit) | |
| muscular(adjective, strong, sound, tough, fit) |
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| APA | Smart Define. (2016). substantial thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, substantial thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>. |
| MLA | Smart Define. "substantial thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms> |