- Definitions|1
- Thesaurus|748
- Abbreviations|0
110 entries under adjective topic. ×
| indestructible(strong, tough, firm, rigid) | |
| tough(strong, firm, solid, stiff) | |
| adamantine(strong, tough, severe, firm) | |
| rock-hard(firm, rigid, unyielding, steely) | |
| flinty(strong, hard, firm, solid) | |
| impenetrable(firm, solid, stiff, rigid) | |
| shatterproof(strong, tough) | |
| infrangible(strong, tough) | |
| unyielding(strong, hard, tough, severe) | |
| rigid(strong, hard, severe, firm) | |
| firm(strong, hard, tough, severe) | |
| steely(firm, rigid, unyielding) | |
| solid(strong, hard, tough, severe) | |
| hard(strong, severe, firm, harsh) | |
| resistant(strong, hard, tough, solid) | |
| adamant(firm, rigid, unyielding, steely) | |
| rocky(firm, stiff, rigid, unyielding) | |
| rugged(strong, tough) | |
| sturdy | |
| tight(strong, hard, tough, solid) |
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| APA | Smart Define. (2016). unbreakable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, unbreakable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>. |
| MLA | Smart Define. "unbreakable thesaurus" 5 January 2016. Web. 23 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms> |