32 entries under cool topic. ×

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imperturbable(adjective, calm, steady, detached)
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nerveless(calm, unflappable)
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nonchalant(calm, composed, unflappable)
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roll with punches(expression, idiom, calm, unflappable)
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self-possessed(calm, composed, unflappable)
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self-satisfied(calm, unflappable)
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smug(calm, unflappable)
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stiff upper lip(expression, idiom, calm, unflappable)
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stoical(calm, unflappable)
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thick-skinned(calm, unflappable)
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unaffected(calm, unflappable)
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untouched(calm, unflappable)
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APASmart Define. (2015). unflustered thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unflustered/thesaurus/synonyms
ChicagoSmart Define. 2015. "unflustered thesaurus" https://smartdefine.org/unflustered/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unflustered thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unflustered/thesaurus/synonyms>.
MLASmart Define. "unflustered thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/unflustered/thesaurus/synonyms>