2
determinate(adjective, certain, limited, definite, inflexible)
2
dogged(adjective, inflexible)
2
enduring(adjective, certain, limited, definite, inflexible)
2
firm(adjective, certain, limited, definite, fixed)
2
hard-and-fast(adjective, hard, inflexible, intent, unalterable)
2
immovable(adjective, inflexible)
2
single-minded(adjective, inflexible)
2
unfaltering(adjective, certain, limited, definite, inflexible)
2
unflinching(adjective, certain, limited, definite, inflexible)
2
unmodifiable(adjective, set, certain, limited, definite)
2
unmovable(adjective, certain, limited, definite, fixed)
2
unwavering(adjective, set, certain, limited, definite)
1
abiding(adjective, certain, limited, definite, inflexible)
1
adamant(adjective, inflexible)
1
agreed(adjective, certain, limited, definite, inflexible)
1
arranged(adjective, certain, limited, definite, inflexible)
1
assiduous
1
certain(adjective, limited, definite, inflexible, restricted)
1
circumscribed(adjective, certain, limited, definite, inflexible)
1
confirmed(adjective, certain, limited, definite, inflexible)
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APASmart Define. (2015). inalterable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/inalterable/thesaurus/synonyms
ChicagoSmart Define. 2015. "inalterable thesaurus" https://smartdefine.org/inalterable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, inalterable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/inalterable/thesaurus/synonyms>.
MLASmart Define. "inalterable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/inalterable/thesaurus/synonyms>