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• s  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

• Sir Mobolaji Bank-Anthony, 59, known as "The Black Englishman" for his impeccable manners and imperturbable air, began by importing cuckoo clocks and marble statues.
• His worldview was famously imperturbable (say the word as Bing would, with the blowfish p's and b's).
• Dapper gentlemen with quick eyes and imperturbable faces frequent, or used to frequent, a little restaurant at 50th Street and Broadway, Manhattan.

• unflappable

News & Articles

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• Father, son run India's Apollo Tyres
  The father-son team leading Apollo Tyres of India has been imperturbable despite vehement criticism for strapping their company with a huge debt to buy a corporation twice its size, Cooper Tire & Rubber Co.
  June 22, 2013 - The Findlay Courier

Quotes

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• Carl Bernstein in Washington Times
  The real thing about her was her imperturbable manner and her constant good nature. She could edit a story so fast and so deftly and a few minutes later your story would be better,recalled Mr. Bernstein, who got his start in journalism as a...
• Tony Abbott in ABC Online
  In his book, Battlelines, Abbott says of Minchin that he is "an effective political warrior ...... imperturbable under attack."