coolheaded

adjective

marked by calm self-control (especially in trying circumstances)
落ち着いた自制心に特徴づけられる（とくに挑戦的な状況で）」

unemotional
感情的でない
- play it cool
  冷静に振る舞う
- keep cool
  冷静でいる
- stayed coolheaded in the crisis
  危機的な状況においても冷静な状態でいた
- the most nerveless winner in the history of the tournament
  トーナメントの歴史で最も冷静な勝者

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