- Definitions|2
- Thesaurus|985
- Abbreviations|0
202 entries under adjective topic. ×
| unending(persistent, constant, continuous, endless) | |
| unfaltering | |
| unflagging | |
| unmodifiable(set, secure, steady, fixed) | |
| determined(hard, firm, resolute, rigid) | |
| dogged(set, strong, hard, firm) | |
| fast(calm, strong, solid, fixed) | |
| intractable(set, hard, severe, rough) | |
| ironclad | |
| long-lasting(stable, constant, enduring, lasting) | |
| resolved | |
| rigorous(hard, resolute, rigid, inflexible) | |
| set(calm, strong, secure, firm) | |
| stiff(set, hard, severe, rough) | |
| timeless(lasting, permanent, everlasting, unending) | |
| tough(calm, strong, rough, solid) | |
| unbending(hard, firm, rigid, inflexible) | |
| uncompromising(hard, secure, rough, firm) | |
| undaunted | |
| unvaried |
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| APA | Smart Define. (2015). immutable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/immutable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "immutable thesaurus" https://smartdefine.org/immutable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, immutable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/immutable/thesaurus/synonyms>. |
| MLA | Smart Define. "immutable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/immutable/thesaurus/synonyms> |