16
changeless(adjective, severe, firm, harsh, solid)
16
persistent(adjective, strong, tough, flat, firm)
16
unalterable(adjective, strong, hard, secure, severe)
15
secure(adjective, strong, hard, sound, tough)
14
lasting(adjective, strong, tough, firm, stable)
14
resolved(verb, adjective, set, strong, flat)
14
traditional(adjective, state, quality, firm, common)
14
unvarying(adjective, dull, clear, firm, solid)
13
decided(verb, adjective, set, firm, solid)
13
regular(adjective, firm, solid, exact, proper)
13
solid(adjective, set, strong, hard, sound)
12
eternal(adjective, wild, original, persistent, basic)
12
motionless(adjective, calm, quiet, strong, secure)
12
predetermined(adjective, set, usual, careful, thoughtful)
12
sedentary(adjective, quiescence)
12
sure(adjective, clear, strong, flat, firm)
12
tight(adjective, adverb, close, strong, hard)
12
unmoving(adjective, move, calm, strong, secure)
11
arranged(verb, adjective, set, certain, ready)
11
everlasting(adjective, stable, persistent, constant, continuous)
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APASmart Define. (2016). fixed thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms
ChicagoSmart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, fixed thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>.
MLASmart Define. "fixed thesaurus" 16 March 2016. Web. 20 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms>