- Definitions|1
- Thesaurus|748
- Abbreviations|0
110 entries under adjective topic. ×
| immortal | |
| immutable | |
| indelible | |
| indigestible(strong, hard, solid, stiff) | |
| indurate(firm, stiff, rigid) | |
| indurated(firm, stiff, rigid) | |
| ineradicable | |
| inextirpable | |
| inseparable | |
| iron(firm, stiff, rigid) | |
| leathery(strong, hard, solid, stiff) | |
| lusty(strong, hard, solid, stiff) | |
| non-breakable | |
| non-perishable | |
| obdurate | |
| packed(firm, stiff, rigid) | |
| perpetual | |
| protected(strengthened, reinforced) | |
| rigorous | |
| rocklike(firm, stiff, rigid) |
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| APA | Smart Define. (2016). unbreakable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, unbreakable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>. |
| MLA | Smart Define. "unbreakable thesaurus" 5 January 2016. Web. 26 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms> |