- Definitions|1
- Thesaurus|693
- Abbreviations|0
| insusceptible of change(expression, idiom) | |
| intent(strong, certain, definite, resolved) | |
| intractile | |
| intransmutable | |
| iron | |
| irreconcilable | |
| irreparable | |
| irresilient | |
| irresistible(adjective, expected, predictable, necessary, inexorable) | |
| last | |
| like the Rock of Gibralter(expression, adjective, idiom, steady, stable) | |
| locked in(expression, fixed, stiff, impassive, inflexible) | |
| long-lasting | |
| methodical(adjective, even, rigid, inflexible, reliable) | |
| monochrome(adjective, dull, steady, stable, regular) | |
| monophonic(adjective, dull, steady, stable, regular) | |
| monotonous(adjective, dull, set, steady, stable) | |
| nailed(calm, strong, solid, certain, steady) | |
| necessary(expected, predictable, inexorable, required, obligatory) | |
| no ifs ands or buts(expression, expected, predictable, necessary, inexorable) |
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| APA | Smart Define. (2015). unalterable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unalterable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unalterable thesaurus" https://smartdefine.org/unalterable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unalterable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unalterable/thesaurus/synonyms>. |
| MLA | Smart Define. "unalterable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unalterable/thesaurus/synonyms> |