65 entries under rigid topic. ×

8
resolved(adjective, strong, flat, certain, determined)
8
unbending(adjective, strong, flat, certain, determined)
8
uncompromising(adjective, complete, secure, certain, true)
8
undeviating(adjective, strong, flat, certain, determined)
7
adamant(adjective, strong, definite, inflexible)
7
hard(adjective, resolute, inflexible, strict)
7
set(adjective, calm, strong, secure, flat)
7
stiff(adjective, set, hard, resolute)
7
uniform(adjective, calm, set, strong, secure)
6
definite(adjective, strong, flat, certain, determined)
6
dogged(adjective, set, hard, stiff, resolute)
6
perpetual(adjective, set, regular, fixed)
6
solid(adjective, calm, strong, secure, firm)
6
strong(adjective, calm, solid, substantial, constant)
6
unmodifiable(adjective, secure, certain, steady, limited)
5
implacable(adjective, hard, resolute, inflexible)
5
intractable(adjective, set, hard, stiff)
5
regular(adjective, set, firm, solid, stable)
5
rigorous(adjective, hard, resolute, inflexible)
5
steely(adjective, set, hard, stiff, resolute)
11 years ago|11k views|share |citing 
APASmart Define. (2015). unchangeable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unchangeable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unchangeable thesaurus" https://smartdefine.org/unchangeable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unchangeable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unchangeable/thesaurus/synonyms>.
MLASmart Define. "unchangeable thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/unchangeable/thesaurus/synonyms>