im·per·turb·able /ˌɪmpɚ/
(a.)沈著的,泰然自若的,鎮靜的
Im·per·turb·a·ble a. Incapable of being disturbed or disconcerted; as, imperturbable gravity.
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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]