EN placidity
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{noun}

placidity (also: calmness, composure, coolness, countenance)
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спокойствие [споко́йствие] {n}
placidity (also: insouciance, serenity, tranquillity)
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безмятежность [безмяте́жность] {f}
placidity (also: comfort, peace, quiescence, quiescency)
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покой [поко́й] {m}