not easily upset or worried by a difficult situation; calm 冷静的;不易生气的;沉着的 Above all he was imperturbable and never upset when things appeared to go against him. 最重要的是,当事情似乎对他不利时,他不动声色,从不沮丧。 She faces challenges with imperturbable calm. 她沉着冷静地面对挑战。
Word Originlate Middle English: from late Latin imperturbabilis, from in- ‘not’ + perturbare (from per- ‘completely’ + turbare ‘disturb’).