76 entries under even topic. ×

32
permanent(adjective, calm, strong, secure, firm)
25
fixed(adjective, hard, secure, rough, firm)
25
unalterable(adjective, calm, strong, hard, secure)
25
unchangeable(adjective, calm, strong, secure, firm)
23
unchanging(adjective, firm, steady, stable, regular)
22
constant(adjective, calm, strong, secure, firm)
20
invariable(adjective, calm, strong, secure, firm)
17
enduring(adjective, calm, strong, secure, firm)
15
abiding(adjective, calm, strong, secure, firm)
14
lasting(adjective, calm, strong, secure, firm)
13
steadfast(adjective, calm, strong, secure, firm)
13
uniform(adjective, calm, strong, secure, firm)
12
firm(adjective, calm, strong, hard, secure)
12
stable(adjective, dull, secure, firm, steady)
10
inflexible(adjective, set, hard, secure, rough)
10
steady(adjective, calm, strong, secure, firm)
9
unvarying(adjective, calm, strong, secure, firm)
8
consistent(adjective, dull, steady, stable, regular)
8
rigid(adjective, set, hard, regular, fixed)
7
irreversible(adjective, fixed, rigid, inflexible)
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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>