unflappable
adj. 镇定自若的；临危不乱的
副词：unflappably 名词：unflappability
近义词：composed，collected，imperturbable，calm，level-headed，coolasacucumber，cool，serene，self-possessed，
英英释义
Adjective
- not easily perturbed or excited or upset; marked by extreme calm and composure;
"hitherto imperturbable, he now showed signs of alarm" "an imperturbable self-possession" "unflappable in a crisis"
例句
- A busy manager needs a completely unflappable secretary.经理工作忙就需要一个头脑十分冷静的秘书。