| tough as leather(expression, idiom) | |
| unaltered | |
| unceasing(adjective, permanent, recurrent, perpetual, long-term) | |
| unending(adjective, enduring, lasting, permanent, perpetual) | |
| unfading(stable, constant, enduring, lasting, perpetual) | |
| unremitting(permanent, long-term, lifelong, diuturnity) | |
| unvarying(adjective, calm, strong, secure, firm) | |
| wear-resistant | |
| of long standing(expression, idiom) | |
| able(adjective, strong, sound, tough, solid) | |
| active(adjective, strong, sound, tough, solid) | |
| aeonian | |
| affectionate | |
| age-long | |
| anchored(calm, strong, secure, solid, steady) | |
| antique | |
| antitypous | |
| ardent(adjective, firm, solid, true, stable) | |
| arms | |
| athletic(adjective, strong, sound, tough, solid) |
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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> |