资料来源 : pyDict

沈著的,泰然自若的,镇静的

资料来源 : WordNet®

imperturbable
     adj : 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" [syn: {unflappable}]