7 entries under flexible topic. ×

11
unalterable(adjective, inflexible, changeable)
9
unchangeable(adjective, certain, limited, definite, fixed)
8
invariable(adjective, inflexible, changing)
7
immutable(adjective, inflexible)
5
inflexible(adjective, set, certain, limited, definite)
4
ironclad(adjective, inflexible)
3
rigid(adjective, inflexible)
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APASmart Define. (2015). inalterable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/inalterable/thesaurus/synonyms
ChicagoSmart Define. 2015. "inalterable thesaurus" https://smartdefine.org/inalterable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, inalterable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/inalterable/thesaurus/synonyms>.
MLASmart Define. "inalterable thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/inalterable/thesaurus/synonyms>