phlegmatic
adjective formal uk/fleɡˈmæt.ɪk/ us/fleɡˈmæt̬.ɪk/
冷静的，沉着的，镇定的
A phlegmatic person does not usually get emotional or excited about things.
As a football player, his great asset was his calm, phlegmatic manner. 作为一名足球运动员，他最大的优点是他在场上沉着冷静的风度。