110 entries under placid topic. ×

80
calm(adjective, feature, state, calm, quiet)
78
tranquil(adjective, feature, state, calm, quiet)
46
composed(adjective, calm, quiet, light, cool)
43
cool(adjective, feature, state, calm, quiet)
37
unruffled(adjective, calm, quiet, cool, smooth)
26
sedate(adjective, calm, quiet, cool, reasonable)
24
imperturbable(adjective, calm, quiet, cool, smooth)
23
collected(adjective, calm, quiet, cool, smooth)
23
easygoing(adjective, feature, state, calm, quiet)
21
dispassionate(adjective, calm, quiet, cool, moderate)
21
pacific(noun, adjective, calm, quiet, cool)
18
even-tempered(adjective, calm, quiet, smooth, easy)
18
nonchalant(adjective, feature, state, calm, quiet)
17
easy(adjective, feature, state, calm, quiet)
17
unflappable(adjective, calm, quiet, cool, moderate)
16
mild(adjective, feature, state, calm, quiet)
16
smooth(adjective, calm, quiet, light, cool)
14
equable(adjective, calm, quiet, cool, kind)
14
gentle(adjective, calm, quiet, light, cool)
10
patient(verb, adjective, calm, quiet, cool)
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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>