65 entries under secure topic. ×
| reliable(adjective, calm, strong, tough) | |
| stalwart(adjective, calm, strong, sound) | |
| tenacious(adjective, strong, sound, tough) | |
| unchangeable(adjective, calm, strong, firm) | |
| set(verb, adjective, calm, strong) | |
| immovable(adjective, strong, firm, solid) | |
| staunch(adjective, calm, strong, sound) | |
| well-founded(adjective, calm, strong, sound) | |
| immobile(strong, substantial, stable, unmoving) | |
| set in stone(expression, adjective, idiom, calm, strong) | |
| solid as a rock(expression, adjective, idiom, calm, strong) | |
| sure(adjective, calm, strong, firm) | |
| unvarying(adjective, calm, strong, firm) | |
| anchored(calm, strong, solid, steady) | |
| balanced(adjective, calm, strong, firm) | |
| brick-wall(adjective, calm, strong, firm) | |
| calm(adjective, strong, firm, solid) | |
| equable(adjective, calm, strong, firm) | |
| even(adjective, calm, strong, firm) | |
| fastened(strong, firm, true, substantial) |
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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> |