61 entries under rigid topic. ×

2
undiversified(adjective, set, regular, even, constant)
2
unfailing(set, regular, fixed, constant)
2
unrelenting(adjective, set, hard, stiff, persistent)
1
fated(adjective, fixed, even, inflexible)
1
habitual(adjective, dull, steady, stable, regular)
1
hard-and-fast(adjective, set, hard, stiff)
1
monotonous(adjective, dull, set, steady, stable)
1
obdurate(adjective, hard, steady, fixed)
1
stringent(adjective, set, hard, stiff)
1
true(adjective, strong, firm, determined, serious)
1
uncompliant(adjective, set, hard, stiff)
1
unswayable(adjective, set, hard, stiff)
0
compatible(adjective, even, inflexible, reliable)
0
dyed-in-the-wool(hard, resolute, inflexible, strict)
0
fateful(adjective, even, inflexible, reliable)
0
incorrigible(adjective, even, inflexible, reliable)
0
normal(adjective, even, inflexible, reliable)
0
ossified(adjective, even, inflexible, reliable)
0
plumb(adjective, even, inflexible, reliable)
0
same(set, regular, fixed, constant)
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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>