170 entries under tranquil topic. ×

6
resting(adjective, calm, peaceful, undisturbed)
6
silent(adjective, calm, quiet, smooth, gentle)
6
unconcerned(adjective, feature, state, calm, quiet)
6
unemotional(adjective, calm, quiet, cool, moderate)
6
unhurried(adjective, feature, state, calm, quiet)
6
unmoved(adjective, calm, quiet, cool, moderate)
5
at ease(expression, adjective, calm, quiet, light)
5
inactive(adjective, quiet, cool, smooth, mild)
5
motionless(adjective, calm, quiet, cool, smooth)
5
soothing(adjective, calm, quiet, cool, smooth)
4
aloof(adjective, calm, quiet, cool, moderate)
4
at peace(expression, adjective, calm, quiet, cool)
4
contented(adjective, feature, state, calm, quiet)
4
bucolic(adjective, calm, quiet, cool, smooth)
4
hushed(adjective, calm, quiet, cool, smooth)
4
inert(adjective, calm, quiet, smooth)
4
lenient(adjective, calm, quiet, kind, soft)
4
neutral(adjective, calm, quiet, cool, smooth)
4
noiseless(adjective, calm, quiet, smooth)
4
reconciled(verb, adjective, calm, peaceful)
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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>