Declan

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The Japanese word

冷静な

is pronounced
reiseina | れいせいな
means
calm
Examples:
彼の冷静な言葉で私の恐怖は和らいだ。
kare no reisei na kotoba de watashi no kyōfu wa yawarai da.
His calm words allayed my fear.
彼女の冷静な判断のおかげで我々は事故からまぬがれた。
kanojo no reisei na handan no okage de wareware wa jiko kara manugare ta.
Her calm judgement ensured us from accidents.
Examples sourced from tatoeba.org