- Definitions|1
- Thesaurus|748
- Abbreviations|0
11 entries under permanent topic. ×
| tough(adjective, strong, firm, solid, stiff) | |
| adamantine(adjective, strong, tough, severe, firm) | |
| unyielding(adjective, strong, hard, tough, severe) | |
| firm(adjective, strong, hard, tough, severe) | |
| solid(adjective, strong, hard, tough, severe) | |
| hard(adjective, strong, severe, firm, harsh) | |
| resistant(adjective, strong, hard, tough, solid) | |
| tight(adjective, strong, hard, tough, solid) | |
| durable(adjective, strong, hard, tough, firm) | |
| strong(adjective, hard, firm, solid, stiff) | |
| resilient(adjective, strong, hard, solid, stiff) |
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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> |