プログレッシブ和英中辞典(第4版)の解説
へいせい【平静】
〔平穏〕peace；〔落ち着き〕calmness；〔冷静〕composure
平静な quiet; composed; peaceful
心の平静を保った［失った］
I retained [lost] my 「presence of mind [composure].
校内はようやく平静に戻った
The campus finally 「became peaceful [quieted down] again.
平静を装ってはいたが顔は次第に青ざめた
He tried to look unperturbed, but his face gradually lost color.
彼の顔は最後まで平静であった
His face remained serene [tranquil] throughout.
彼は常に平静な態度を失わない
He never loses his self-possession [《俗》 cool].
町は平静であった
The town was quiet.
群衆は平静に退散した
The crowd dispersed quietly [peacefully].
彼は平静に事態を処理した
He coped with the situation calmly.