79 entries under secure topic. ×
| taut(strong, substantial, stable, junction) | |
| well-founded(adjective, calm, strong, solid) | |
| cemented(strong, substantial, stable, unmoving) | |
| inflexible(adjective, close, strong, tough) | |
| motionless(adjective, strong, steady, substantial) | |
| nailed(adjective, calm, strong, firm) | |
| riveted(adjective, strong, substantial, stable) | |
| unchangeable(adjective, calm, strong, firm) | |
| uniform(adjective, calm, strong, firm) | |
| unvarying(adjective, calm, strong, firm) | |
| adamant(adjective, strong, tough, firm) | |
| brick-wall(adjective, calm, strong, firm) | |
| calm(adjective, strong, firm, sensible) | |
| embedded(adjective, strong, substantial, stable) | |
| equable(adjective, calm, strong, firm) | |
| even(verb, adjective, calm, strong, sound) | |
| immotile(steady, fixed, rigid, impassive) | |
| obdurate(adjective, strong, tough, firm) | |
| poised(adjective, calm, strong, firm) | |
| safe(adjective, calm, strong, firm) |
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| APA | Smart Define. (2016). fast thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fast/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, fast thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fast/thesaurus/synonyms>. |
| MLA | Smart Define. "fast thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/fast/thesaurus/synonyms> |