74 entries under fixed topic. ×

8
consistent(adjective, dull, steady, stable, regular)
8
even(adjective, calm, strong, secure, firm)
8
resolute(adjective, calm, strong, hard, determined)
8
rigid(adjective, set, hard, regular)
7
irreversible(adjective, even, rigid, inflexible)
7
unchanged(adjective, static, unvarying, unchangeable)
7
unwavering(adjective, calm, set, strong, solid)
6
immovable(adjective, set, hard, steady, regular)
6
stubborn(adjective, firm, steady, rigid)
5
adamant(adjective, hard, firm, inflexible)
5
irrevocable(adjective, unchangeable)
5
unmodifiable(adjective, set, secure, steady)
4
fast(adjective, calm, strong, solid)
4
set(adjective, calm, strong, secure, firm)
4
uncompromising(adjective, hard, secure, rough, firm)
4
unyielding(adjective, hard, firm, steady)
3
ageless(adjective, lasting, unchanging, permanent)
3
continual(adjective, steady, stable, regular)
3
equable(adjective, calm, strong, secure, firm)
3
secure(calm, strong, steady, substantial)
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APASmart Define. (2015). immutable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/immutable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immutable thesaurus" https://smartdefine.org/immutable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, immutable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/immutable/thesaurus/synonyms>.
MLASmart Define. "immutable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/immutable/thesaurus/synonyms>