140 entries under relaxed topic. ×

2
complaisant(adjective, calm, kind, smooth, soft)
2
cool as cucumber(expression, adjective, idiom, calm, quiet)
2
coolheaded(adjective, calm, quiet, casual)
2
forgiving(adjective, calm, quiet, kind, smooth)
2
good-tempered(adjective, calm, kind, smooth, soft)
2
indolent(adjective, calm, mild, casual)
2
keeping a stiff upper lip(expression, adjective, idiom, calm)
2
leisurely(adjective, calm, quiet, light, smooth)
2
levelheaded(adjective, calm, quiet, cool)
2
not turn a hair(expression, adjective, idiom, calm)
2
obliging(adjective, calm, kind, smooth, soft)
2
repressed(adjective, calm, easygoing, serene)
2
self-assured(adjective, calm, easygoing, serene)
2
sensible(adjective, calm, reasonable, restrained)
2
snug(adjective, calm, quiet, light, smooth)
2
submissive(adjective, calm, quiet, kind, smooth)
2
unaffected(adjective, calm, cool, informal)
1
accommodating(adjective, calm, quiet, gentle, informal)
1
amenable(mild, tolerant, laid-back, obedient)
1
calmed(adjective, calm, easygoing, serene)
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APASmart Define. (2016). tranquil thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/tranquil/thesaurus/synonyms
ChicagoSmart Define. 2016. "tranquil thesaurus" https://smartdefine.org/tranquil/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, tranquil thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/tranquil/thesaurus/synonyms>.
MLASmart Define. "tranquil thesaurus" 3 March 2016. Web. 27 September 2026. <https://smartdefine.org/tranquil/thesaurus/synonyms>