- Definitions|1
- Thesaurus|1.1k
- Abbreviations|0
| faithful(adjective, resolute) | |
| fast(adjective, calm, strong, secure, firm) | |
| fated | |
| fearless(adjective, resolute) | |
| hard-and-fast(adjective, set, hard, certain, stiff) | |
| incessant(adjective, continuous) | |
| incontestable(adjective, clear, certain, definite, unquestionable) | |
| incorrigible | |
| indisputable(clear, certain, definite, unquestionable, undisputable) | |
| ineluctable(adjective, certain, unquestionable, undisputable, unavoidable) | |
| inescapable(adjective, certain, unquestionable, undisputable, unavoidable) | |
| interminable(adjective, continuous) | |
| invariant | |
| inveterate(adjective, certain, limited, definite, inflexible) | |
| ironclad(adjective, flexible) | |
| limited(adjective, certain, definite, inflexible, restricted) | |
| monotonous(adjective, continuous) | |
| mulish(adjective, obstinacy) | |
| parochial | |
| pigheaded(adjective, obstinate, stubborn, unbending) |
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| APA | Smart Define. (2015). unchangeable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unchangeable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unchangeable thesaurus" https://smartdefine.org/unchangeable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, unchangeable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unchangeable/thesaurus/synonyms>. |
| MLA | Smart Define. "unchangeable thesaurus" 3 August 2015. Web. 23 September 2026. <https://smartdefine.org/unchangeable/thesaurus/synonyms> |