2
heavenly(adjective, calm, quiet, peaceful, tranquil)
2
impassive(adjective, quiet, cool, still, peaceful)
2
isolated(adjective, mild, shy, stable, peaceful)
2
lenient(adjective, calm, quiet, smooth, soft)
2
measured(adjective, calm, quiet, easy, mild)
2
mellow(adjective, calm, quiet, smooth, soft)
2
motionless(adjective, calm, quiet, cool, smooth)
2
nonviolent(calm, quiet, friendly, serene)
2
peacetime
2
propitious(adjective, fortunate, favorable)
2
reasonable(adjective, calm, good, quiet, easy)
2
relaxed(adjective, calm, quiet, cool, easy)
2
relaxing
2
reposing(adjective, quiet, cool, smooth, mild)
2
roaring(adjective, rich, robust, thriving, loaded)
2
rosy(fortunate, favorable)
2
secluded(adjective, mild, shy, stable, peaceful)
2
sequestered(adjective, mild, shy, stable, peaceful)
2
sleek
2
slow(adjective, calm, quiet, cool, smooth)
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APASmart Define. (2016). halcyon thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/halcyon/thesaurus/synonyms
ChicagoSmart Define. 2016. "halcyon thesaurus" https://smartdefine.org/halcyon/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, halcyon thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/halcyon/thesaurus/synonyms>.
MLASmart Define. "halcyon thesaurus" 29 February 2016. Web. 24 September 2026. <https://smartdefine.org/halcyon/thesaurus/synonyms>