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He described imperturbability as a physical quality — a steadiness of hand and coolness of nerve under pressure which reassures patients and colleagues. Osler observed that these two qualities ...

Imperturbability ... is the quality which is most appreciated by the laity though often misunderstood by them; and the physician who has the misfortune to be without it, who betrays indecision and ...

His defining characteristic – imperturbability – should be emulated by other bank bosses. It is hard to imagine Mr McEwan railing against critics as Standard Chartered’s Bill Winters has.