170 entries under tranquil topic. ×

2
listless(adjective, calm, quiet, cool, moderate)
2
pleasant(adjective, calm, quiet, light, secure)
2
remote(adjective, shy, stable, peaceful, unconcerned)
2
self-assured(adjective, calm, happy, relaxed)
2
unflustered(adjective, calm, cool, steady, detached)
1
amicable(adjective, calm, quiet, cool, smooth)
1
at rest(expression, adjective, idiom, calm, quiet)
1
soundless(adjective, calm, quiet, smooth)
1
stationary(adjective, calm, quiet, smooth)
1
windless(adjective, quiet, cool, smooth, mild)
1
at a standstill(expression, adjective, idiom, quiet, cool)
1
breathless(adjective, quiet, cool, smooth, mild)
1
breezeless(adjective, quiet, cool, smooth, mild)
1
buttoned up(expression, adjective, calm, quiet, smooth)
1
civil(adjective, quiet, cool, kind, moderate)
1
clammed up(expression, adjective, calm, quiet, smooth)
1
clearheaded(adjective, calm, relaxed, easygoing)
1
close-mouthed(adjective, calm, close, quiet, smooth)
1
closed(adjective, calm, quiet, smooth)
1
commonsensical(adjective, calm, relaxed, restrained)
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APASmart Define. (2015). serene thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serene/thesaurus/synonyms
ChicagoSmart Define. 2015. "serene thesaurus" https://smartdefine.org/serene/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, serene thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serene/thesaurus/synonyms>.
MLASmart Define. "serene thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/serene/thesaurus/synonyms>