- Definitions|1
- Thesaurus|748
- Abbreviations|0
35 entries under firm topic. ×
| indestructible(adjective, strong, tough, rigid) | |
| tough(adjective, strong, solid, stiff) | |
| adamantine(adjective, strong, tough, severe) | |
| rock-hard(adjective, rigid, unyielding, steely) | |
| flinty(adjective, strong, hard, solid) | |
| impenetrable(adjective, solid, stiff, rigid) | |
| unyielding(adjective, strong, hard, tough, severe) | |
| rigid(adjective, strong, hard, severe) | |
| steely(adjective, rigid, unyielding) | |
| solid(adjective, strong, hard, tough, severe) | |
| hard(adjective, strong, severe, harsh) | |
| adamant(adjective, rigid, unyielding, steely) | |
| rocky(adjective, stiff, rigid, unyielding) | |
| durable(adjective, strong, hard, tough) | |
| stony(adjective, stiff, rigid, unyielding) | |
| strong(adjective, hard, solid, stiff) | |
| harsh(adjective, severe, solid, stiff) | |
| stiff(adjective, strong, hard, severe) | |
| definite(adjective, severe, harsh, solid) | |
| inflexible(adjective, strong, hard, severe) |
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| APA | Smart Define. (2016). unbreakable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, unbreakable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>. |
| MLA | Smart Define. "unbreakable thesaurus" 5 January 2016. Web. 25 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms> |