2
civil(adjective, quiet, cool, kind, gentle)
2
commodious(adjective, calm, quiet, light, smooth)
2
complaisant(adjective, calm, kind, smooth, soft)
2
conciliatory(adjective, easygoing, compliant, soothing, appeasing)
2
cool as cucumber(expression, adjective, idiom, calm, quiet)
2
coolheaded(adjective, calm, quiet, relaxed, casual)
2
dead(adjective, motionless)
2
decorous(calm, quiet, cool, obedient, disciplined)
2
dormant(adjective, motionless)
2
earnest(calm, cool, dignified)
2
fixed(adjective, calm, quiet, smooth, shy)
2
flush(adjective, quiet, soft, gentle, flat)
2
forgiving(adjective, calm, quiet, kind, smooth)
2
free from strife(expression, idiom, calm, quiet, friendly)
2
frigid(adjective, unexcitable)
2
genial(adjective, calm, kind, moderate, gentle)
2
glassy(adjective, quiet, soft, gentle, flat)
2
good-tempered(adjective, calm, kind, smooth, soft)
2
harmonious(adjective, calm, quiet, cool, smooth)
2
homelike(adjective, house, home, family, private)
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APASmart Define. (2016). tranquil thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/tranquil/thesaurus/synonyms
ChicagoSmart Define. 2016. "tranquil thesaurus" https://smartdefine.org/tranquil/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, tranquil thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/tranquil/thesaurus/synonyms>.
MLASmart Define. "tranquil thesaurus" 3 March 2016. Web. 22 September 2026. <https://smartdefine.org/tranquil/thesaurus/synonyms>