3
sure(adjective, calm, strong, definite, constant)
2
abiding(adjective, calm, strong, secure, flat)
2
binding(adjective, set, strict, expected, predictable)
2
dead set on(expression, idiom, definite, fixed, impassive)
2
decided(adjective, definite, absolute, obvious, expected)
2
equable(adjective, calm, strong, secure, firm)
2
even(adjective, calm, strong, secure, firm)
2
incurable
2
indisputable
2
ineluctable(adjective, expected, predictable, necessary, inexorable)
2
inescapable(adjective, expected, predictable, necessary, inexorable)
2
intransigent(severe, steady, fixed, stiff, impassive)
2
secure(calm, strong, steady, substantial, fixed)
2
severe(adjective, stern, uncompromising)
2
staunch(adjective, calm, strong, hard, solid)
2
steely(adjective, set, hard, stiff, inflexible)
2
unflinching(strong, certain, determined, definite, fixed)
2
unmoved(determined, fixed, stubborn)
2
unrelenting(adjective, close, set, severe, harsh)
2
unremitting(adjective, persistent, continuous, endless, relentless)
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APASmart Define. (2015). unalterable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unalterable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unalterable thesaurus" https://smartdefine.org/unalterable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unalterable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unalterable/thesaurus/synonyms>.
MLASmart Define. "unalterable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unalterable/thesaurus/synonyms>