25
unalterable(adjective, calm, strong, definite, fixed)
24
fixed(adjective, strong, complete, secure, flat)
23
immutable(adjective, calm, strong, secure, firm)
20
permanent(adjective, calm, strong, solid, substantial)
18
unchanging(adjective, moderate, firm, solid, certain)
18
inflexible(adjective, strong, secure, moderate, flat)
17
constant(adjective, calm, strong, secure, moderate)
17
immovable(adjective, set, secure, firm, solid)
17
invariable(adjective, calm, set, strong, secure)
15
firm(adjective, calm, strong, secure, moderate)
15
resolute(adjective, calm, strong, secure, flat)
14
steadfast(adjective, calm, strong, secure, flat)
13
changeless(adjective, firm, solid, certain, stable)
12
inevitable(adjective, certain, fixed, constant, steadfast)
12
stable(adjective, strong, secure, moderate, flat)
12
stubborn(adjective, steady, fixed, resolute, rigid)
11
determined(adjective, strong, hard, definite, resolute)
11
obstinate(adjective, moderate, rigid, cautious, strict)
11
persistent(adjective, strong, certain, definite, resolute)
11
steady(adjective, calm, strong, secure, moderate)
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APASmart Define. (2015). unchangeable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unchangeable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unchangeable thesaurus" https://smartdefine.org/unchangeable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, unchangeable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unchangeable/thesaurus/synonyms>.
MLASmart Define. "unchangeable thesaurus" 3 August 2015. Web. 21 September 2026. <https://smartdefine.org/unchangeable/thesaurus/synonyms>