4
merciful(adjective, calm, kind, soft, moderate)
4
neutral(adjective, calm, quiet, cool, smooth)
4
noiseless(adjective, calm, quiet, smooth, tranquil)
4
reconciled(verb, adjective, calm, peaceful, tranquil)
4
self-contained(adjective, close, quiet, cool, gentle)
4
sensible(adjective, calm, happy, firm, solid)
4
serious(adjective, calm, cool, sensible, relaxed)
4
stolid(adjective, calm, quiet, cool, relaxed)
4
sunny(adjective, feature, state, quiet, trait)
4
together(adjective, calm, quiet, cool, relaxed)
4
undemanding(adjective, feature, state, calm, quiet)
3
bright(adjective, clear)
3
calmed(adjective, calm, happy, relaxed, welcome)
3
cloudless
3
delightful(adjective, secure, soft, pleasant, easy)
3
enjoyable(adjective, feature, state, secure, soft)
3
flat(adjective, calm, quiet, kind, smooth)
3
forbearing(adjective, calm, quiet, kind, smooth)
3
frigid(adjective, quiet, gentle, aloof, reserved)
3
good-natured(adjective, calm, kind, smooth, soft)
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APASmart Define. (2015). serene thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serene/thesaurus/synonyms
ChicagoSmart Define. 2015. "serene thesaurus" https://smartdefine.org/serene/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, serene thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serene/thesaurus/synonyms>.
MLASmart Define. "serene thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/serene/thesaurus/synonyms>