- Definitions|2
- Thesaurus|371
- Abbreviations|0
11 entries under firm topic. ×
| unbreakable(adjective, strong, tough, rigid) | |
| impenetrable(adjective, rigid, unyielding, steely) | |
| tough(adjective, rigid, unyielding, steely) | |
| adamantine(adjective, rigid, unyielding, steely) | |
| rock-hard(adjective, rigid, unyielding, steely) | |
| flinty(adjective, rigid, unyielding, steely) | |
| hard(adjective, strong, rigid, unyielding) | |
| adamant(adjective, rigid, unyielding, steely) | |
| steely(adjective, rigid, unyielding) | |
| stony(adjective, rigid, unyielding, steely) | |
| rocky(adjective, rigid, unyielding, steely) |
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| APA | Smart Define. (2015). indestructible thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/indestructible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indestructible thesaurus" https://smartdefine.org/indestructible/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, indestructible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/indestructible/thesaurus/synonyms>. |
| MLA | Smart Define. "indestructible thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/indestructible/thesaurus/synonyms> |