Calmness; composure; the ability to stay cool-headed and make rational judgments.
彼は緊急時でも冷静に行動した。
He acted calmly even in an emergency.
まずは深呼吸して、冷静な判断をしましょう。
First take a deep breath and make a calm judgment.
冷静な分析が問題解決の鍵だ。
Calm analysis is the key to solving the problem.