128 entries under unruffled topic. ×

4
grave(adjective, calm, quiet, cool, reasonable)
4
sensible(adjective, calm, happy, firm, solid)
4
serious(adjective, calm, cool, sensible, relaxed)
4
stolid(adjective, calm, quiet, cool, relaxed)
4
together(adjective, calm, quiet, cool, relaxed)
4
undemanding(adjective, feature, state, calm, quiet)
3
calmed(adjective, calm, happy, relaxed, welcome)
3
levelheaded(adjective, calm, quiet, cool, reasonable)
3
possessed(adjective, calm, quiet, cool, easy)
3
practical(adjective, calm, sensible, restrained, thoughtful)
3
rational(adjective, calm, quiet, reasonable, sensible)
3
realistic(adjective, calm, sensible, dark, restrained)
3
reasonable(adjective, calm, quiet, easy, sensible)
3
secure(adjective, calm, quiet, light, smooth)
2
cold(adjective, calm, close, quiet, cool)
2
earnest(adjective, calm, quiet, cool, reasonable)
2
leisurely(adjective, calm, quiet, light, smooth)
2
plain(adjective, calm, quiet, light, simple)
2
pleasant(adjective, calm, quiet, light, secure)
2
self-assured(adjective, calm, happy, relaxed, tranquil)
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APASmart Define. (2015). serene thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/serene/thesaurus/synonyms
ChicagoSmart Define. 2015. "serene thesaurus" https://smartdefine.org/serene/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, serene thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/serene/thesaurus/synonyms>.
MLASmart Define. "serene thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/serene/thesaurus/synonyms>