Synonyms|468Antonyms|98|Broader|6Narrower|0Related|413
2
immortal
2
implacable(hard, resolute, rigid, inflexible, strict)
2
indefatigable
2
indisputable
2
indomitable(hard, resolute, rigid, inflexible, strict)
2
inert
2
inexorable(hard, resolute, rigid, inflexible, strict)
2
infinite
2
intransigent(steady, fixed, impassive, inflexible, stubborn)
2
invariant
2
irretrievable
2
level(adjective, even, rigid, inflexible, reliable)
2
long-lived
2
loyal
2
monolithic(adjective, even, rigid, inflexible, reliable)
2
of a piece(expression, adjective, idiom, steady, stable)
2
ordered(adjective, even, rigid, inflexible, reliable)
2
orderly(adjective, even, rigid, inflexible, reliable)
2
perdurable(calm, strong, solid, substantial, constant)
2
perduring(stable, constant, enduring, lasting, perpetual)
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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>