collected

collected
adj [pred 作表语]
in control of oneself; calm (used esp in the expression shown) 镇定, 镇静, 冷静, 泰然自若（尤用於以下示例）
    She always stays cool, calm and collected in a crisis. 她在危难时总是很冷静、 镇定如常、 泰然自若.

牛津英汉双解词典