112 entries under firm topic. ×
| abiding(adjective, calm, strong, secure, tough) | |
| fixed(adjective, strong, sound, secure, tough) | |
| well-built(adjective, calm, strong, sound, secure) | |
| dependable(adjective, strong, tough, solid) | |
| changeless(adjective, set, solid, stable) | |
| reliable(adjective, calm, strong, secure, tough) | |
| stalwart(adjective, calm, strong, sound, secure) | |
| tenacious(adjective, strong, sound, secure, tough) | |
| unchangeable(adjective, calm, strong, secure) | |
| unbreakable(adjective, strong, hard, tough) | |
| unchanging(adjective, set, solid, steady) | |
| set(verb, adjective, calm, strong, secure) | |
| immovable(adjective, strong, secure, solid) | |
| staunch(adjective, calm, strong, sound, secure) | |
| well-founded(adjective, calm, strong, sound, secure) | |
| adamantine(adjective, strong, tough, stiff) | |
| dense(adjective, strong, hard, solid) | |
| faithful(true, fixed, constant, steadfast) | |
| intense(adjective, solid, stable, fixed) | |
| iron(adjective, stiff, rigid) |
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| APA | Smart Define. (2015). durable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/durable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "durable thesaurus" https://smartdefine.org/durable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, durable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/durable/thesaurus/synonyms>. |
| MLA | Smart Define. "durable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/durable/thesaurus/synonyms> |