imperturbability

from WordNet (r) 3.0 (2006)

imperturbability
    n 1: calm and unruffled self-assurance; "he performed with all
         the coolness of a veteran" [syn: {coolness},
         {imperturbability}, {imperturbableness}]

from The Collaborative International Dictionary of English v.0.48

Imperturbability \Im`per*turb`a*bil"i*ty\, n.
   The state or quality of being imperturbable.
   [1913 Webster]

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