Hypertext Webster Gateway: "imperturbable"
From WordNet (r) 1.7 (wn)
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}]
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