6
tranquil(adjective, calm, quiet, smooth, soft)
6
true(adjective, good, strong, smooth, right)
6
trusty(adjective, good, strong, honest, solid)
6
unflinching(adjective, strong, flat, determined, definite)
6
uninterrupted(adjective, calm, quiet, direct, smooth)
6
unshakable(adjective, strong, hard, secure, continue)
5
anchored(adjective, strong, secure, firm, solid)
5
continual(adjective, direct, smooth, right, flat)
5
deep-rooted(adjective, steady, fixed, even, constant)
5
determined(adjective, good, strong, easy, flat)
5
devoted(adjective, good, strong, honest, solid)
5
flat(adjective, calm, quiet, strong, direct)
5
hardy(adjective, strong, sound, tough, solid)
5
hearty(adjective, strong, sound, complete, tough)
5
level(adjective, quiet, direct, smooth, right)
5
long-lasting(adjective, tough, sturdy, constant, enduring)
5
motionless(adjective, calm, dull, quiet, strong)
5
orderly(adjective, calm, smooth, steady, temperate)
5
persisting(adjective, persistent, continuous, endless, relentless)
5
poised(adjective, calm, quiet, easy, firm)
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APASmart Define. (2015). stable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>