- Definitions|1
- Thesaurus|748
- Abbreviations|0
| everlasting(adjective, strong, tough) | |
| durable(adjective, strong, hard, tough, firm) | |
| stony(adjective, firm, stiff, rigid, unyielding) | |
| lasting(adjective, strong, tough) | |
| eternal | |
| unshakable(adjective, strong, tough) | |
| inviolable(adjective, indestructible) | |
| permanent | |
| strong(adjective, hard, firm, solid, stiff) | |
| armored(adjective, strong, tough) | |
| brass-bound(adjective, strong, tough) | |
| endless | |
| good | |
| harsh(adjective, severe, firm, solid, stiff) | |
| imperishable | |
| indissoluble | |
| indivisible(adjective, tenacity, indissoluble) | |
| nonbreakable(adjective, strong, tough) | |
| real | |
| secure(adjective, strengthened, reinforced) |
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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> |