110 entries under placid topic. ×

2
emotionless(adjective, cool, blank, aloof, unemotional)
2
forgiving(adjective, calm, quiet, kind, smooth)
2
good-tempered(adjective, calm, kind, smooth, soft)
2
indulgent(adjective, calm, kind, soft, gentle)
2
inscrutable(adjective, quiet, cool, moderate, gentle)
2
obliging(adjective, calm, kind, smooth, soft)
2
poker-faced(adjective, calm, cool, detached, blank)
2
subdued(adjective, calm, quiet, kind, smooth)
2
unassuming(adjective, calm, quiet, kind, smooth)
1
agreeable(adjective, calm, quiet, secure, smooth)
1
balmy(adjective, calm, quiet, kind, smooth)
1
warm(adjective, calm, kind, secure, smooth)
1
callous(adjective, calm, cool, indifferent, restrained)
1
clement(adjective, calm, quiet, kind, smooth)
1
constant(adjective, calm, quiet, smooth, friendly)
1
deferential(adjective, calm, quiet, kind, smooth)
1
feeble(adjective, calm, quiet, kind, smooth)
1
good-humored(adjective, calm, kind, smooth, soft)
1
hardened(adjective, cool, indifferent, blank, aloof)
1
heartless(adjective, cool, blank, aloof, unemotional)
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APASmart Define. (2015). serene thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/serene/thesaurus/synonyms
ChicagoSmart Define. 2015. "serene thesaurus" https://smartdefine.org/serene/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, serene thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/serene/thesaurus/synonyms>.
MLASmart Define. "serene thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/serene/thesaurus/synonyms>