unflappable/ˌʌnˈflæpəbl; ʌn`flæpəbl/ adj(infml 口 esp Brit) remaining calm in a crisis; imperturbable 临危不乱的; 镇定自若的 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.
牛津英汉双解词典