1. 安静的：equanimity 镇定 | equanimous 安静的 | equanimously 安静地

2. 安静的, 镇定的：affable 和蔼可亲的 | equanimous 安静的, 镇定的 | truculence 野蛮, 粗野, 残酷, 好战, 致命性

adj

1. in full control of your faculties

    e.g. the witness remained collected throughout the cross-examination
           perfectly poised and sure of himself
           more self-contained and more dependable than many of the early frontiersmen
           strong and self-possessed in the face of trouble

    Synonym: collectedpoisedself-collectedself-containedself-possessed