- Definitions|1
- Thesaurus|748
- Abbreviations|0
| ineradicable | |
| inextirpable | |
| inseparable | |
| iron(adjective, firm, stiff, rigid) | |
| leathery(adjective, strong, hard, solid, stiff) | |
| lusty(adjective, strong, hard, solid, stiff) | |
| non-breakable | |
| non-perishable | |
| obdurate | |
| packed(adjective, firm, stiff, rigid) | |
| perpetual | |
| protected(adjective, strengthened, reinforced) | |
| reinforced | |
| rigorous | |
| rocklike(adjective, firm, stiff, rigid) | |
| sacrosanct | |
| seasoned(adjective, strong, hard, solid, stiff) | |
| shatter-proof | |
| steeled(adjective, strong, hard, solid, stiff) | |
| thick(adjective, firm, stiff, rigid) |
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| APA | Smart Define. (2016). unbreakable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, unbreakable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>. |
| MLA | Smart Define. "unbreakable thesaurus" 5 January 2016. Web. 24 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms> |