| indissoluble(adjective, strong, permanent, long-term, lifelong) | |
| intense(adjective, firm, solid, stable, fixed) | |
| interminable | |
| intransient | |
| iron(adjective, firm, stiff, rigid) | |
| large(significant, considerable) | |
| lengthy | |
| long-life | |
| longeval | |
| lusty | |
| macrobiotic | |
| prolonged | |
| remaining | |
| rocky(adjective, firm, stiff, rigid) | |
| secure(adjective, calm, strong, sound, tough) | |
| sempervirent | |
| set in stone(expression, adjective, idiom, calm, strong) | |
| sinewy(adjective, strong, hard, sound, tough) | |
| solid as a rock(expression, adjective, idiom, calm, strong) | |
| sure(adjective, calm, strong, secure, firm) |
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| APA | Smart Define. (2015). durable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/durable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "durable thesaurus" https://smartdefine.org/durable/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, durable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/durable/thesaurus/synonyms>. |
| MLA | Smart Define. "durable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/durable/thesaurus/synonyms> |