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cool
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doldrums
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quietude
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sedation
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temperance
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Noun equanimity
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Noun serenity
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Noun tranquility
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placididity
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quiescence
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repose
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rest
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shanti(h)
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silence
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silentness
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soundlessness
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still
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temper
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tranquillity
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uneventfulness
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unflappability
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calm
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calmness
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comfortableness
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composedness
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hush
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moderation
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muteness