Being calm and collected; not easily swayed by emotion and able to make sound judgments or act appropriately under pressure.
彼は冷静沈着な判断でチームを勝利に導いた。
He led the team to victory with calm, composed judgment.
緊急事態でも冷静沈着に対処することが大切だ。
It's important to respond calmly and composedly even in an emergency.
面接官は応募者の冷静沈着さを評価した。
The interviewer evaluated the applicant's calm composure favorably.