- Definitions|1
- Thesaurus|1.1k
- Abbreviations|0
65 entries under rigid topic. ×
| stern(adjective, resolute) | |
| indomitable(adjective, hard, resolute, inflexible) | |
| relentless(adjective, hard, resolute, inflexible) | |
| static(set, regular, fixed, constant) | |
| tough(adjective, calm, strong, solid, substantial) | |
| iron(adjective, set, hard, stiff) | |
| strict(adjective, strong, hard, certain, definite) | |
| unrelenting(adjective, hard, resolute, inflexible) | |
| adamantine(hard, resolute, inflexible, strict) | |
| dyed-in-the-wool(adjective, hard, resolute, inflexible) | |
| exact(adjective, strong, certain, definite) | |
| hard-and-fast(adjective, set, hard, certain, stiff) | |
| severe | |
| unadaptable(adjective, set, hard, stiff) | |
| unfailing(set, clear, certain, regular, definite) | |
| austere | |
| concrete | |
| harsh | |
| stringent(adjective, set, hard, stiff) | |
| taut |
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| APA | Smart Define. (2015). unchangeable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unchangeable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unchangeable thesaurus" https://smartdefine.org/unchangeable/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, unchangeable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unchangeable/thesaurus/synonyms>. |
| MLA | Smart Define. "unchangeable thesaurus" 3 August 2015. Web. 27 September 2026. <https://smartdefine.org/unchangeable/thesaurus/synonyms> |