7
smooth(adjective, calm, quiet, clear, cool)
6
clear(adjective, calm, light, smooth, pleasant)
6
mild(adjective, calm, quiet, cool, smooth)
6
reposeful(adjective, quiet, cool, smooth, mild)
6
sunny(adjective, calm, good, quiet, clear)
5
auspicious(adjective, fortunate, favorable, encouraging)
5
bloodless(calm, quiet, friendly, peace, serene)
5
booming(rich, robust, thriving, loaded, successful)
5
bucolic(adjective, calm, quiet, cool, smooth)
5
cool(adjective, calm, quiet, smooth, moderate)
5
flourishing(adjective, rich, robust, thriving, loaded)
5
gold(adjective, golden, gilded, gilt)
5
hopeful(adjective, fortunate, favorable, promising, auspicious)
5
orderly(adjective, peaceful)
5
thriving(adjective, rich, robust, loaded, successful)
5
unagitated(adjective, calm, peaceful, unconcerned, tranquil)
5
unperturbed(adjective, calm, quiet, easy, mild)
4
at peace(expression, adjective, calm, quiet, clear)
4
bright(pleasant, fair, fortunate, favorable, ringing)
4
easy(adjective, calm, quiet, smooth, moderate)
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APASmart Define. (2016). halcyon thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/halcyon/thesaurus/synonyms
ChicagoSmart Define. 2016. "halcyon thesaurus" https://smartdefine.org/halcyon/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, halcyon thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/halcyon/thesaurus/synonyms>.
MLASmart Define. "halcyon thesaurus" 29 February 2016. Web. 20 September 2026. <https://smartdefine.org/halcyon/thesaurus/synonyms>