Definition of "imperturbability" [im•per•turb•a•bil•i•ty]

• A state of calm, unruffled self-assurance; aplomb, composure. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "His imperturbability was a valuable asset; he never lost heart or dreamed of retiring from the arena, nor did he ever cease to impress his party as being their most useful and acceptable representative."
• "That steely imperturbability which is alternately the pride and pleasure of Mr. Untermyer's friends, the glittering surface of which it is said no cloud has ever shadowed or no gale disturbed, was fast losing its distinction under the influence of the excitement that welled up in the heaving bosom of the eminent cross-examiner; and excitement and he were so remote, so studiously antagonistic, that I looked on and listened in wonder for the outcome."
• "In other cases it is a communal voice, the voice of a town faced with something unfamiliar that kicks the legs from under a shared sense of middle-class imperturbability."