placid/ˈplæsɪd; `plæsɪd/ adj(a) calm and peaceful; undisturbed 安静的; 平静的; 宁静的 the placid watersof the lake 平静的湖水.(b) (of a person, his temperament,etc) not easily excited or irritated （指人、 性情等）温和的, 文静的 a placid smile 恬静的微笑.
牛津英汉双解词典