- Definitions|2
- Thesaurus|5k
- Abbreviations|0
80 entries under firm topic. ×
| regular(adjective, solid, stable, fixed) | |
| safe(adjective, calm, strong, complete, secure) | |
| staid(adjective, solid, big, heavy) | |
| unwavering(adjective, calm, strong, secure) | |
| abiding(adjective, calm, strong, secure, tough) | |
| brick-wall(adjective, calm, strong, secure) | |
| calm(adjective, quiet, strong, light, secure) | |
| capable(adjective, strong, sound, tough, fit) | |
| equable(adjective, calm, strong, secure) | |
| even(adjective, calm, strong, secure) | |
| incompressible(adjective, density) | |
| poised(adjective, calm, strong, secure) | |
| serene(adjective, calm, quiet, light, smooth) | |
| set in stone(expression, adjective, idiom, calm, strong) | |
| solid as a rock(expression, adjective, idiom, calm, strong) | |
| unchangeable(adjective, calm, strong, secure) | |
| uniform(adjective, calm, strong, secure) | |
| unvarying(adjective, calm, strong, secure) | |
| allegiant(adjective, solid, stable, fixed) | |
| ardent(adjective, solid, enthusiastic, vigorous) |
For more, visit
Substantial on
Power Thesaurus
| APA | Smart Define. (2016). substantial thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, substantial thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>. |
| MLA | Smart Define. "substantial thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms> |