Synonyms|468Antonyms|98|Broader|6Narrower|0Related|413
1
brick-wall(calm, strong, solid, steady, substantial)
1
calm(strong, solid, steady, substantial, even)
1
carved in stone(adjective, fixed)
1
cast-iron
1
certain
1
confirmed(adjective, hard, severe, rough, harsh)
1
connected(adjective, dull, steady, stable, regular)
1
continued(lasting, permanent, everlasting, unending, undying)
1
correspondent
1
creating
1
creation
1
dateless(lasting, permanent, everlasting, unending, undying)
1
dauntless
1
dead set on
1
decisive
1
dedicated
1
deep-rooted(calm, strong, solid, steady, substantial)
1
desperate(adjective, hard, severe, rough, harsh)
1
determinate
1
devoted
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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>