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Adjective: unfazed  ,ún'feyzd
Usage: informal
  1. Free from emotional agitation or nervous tension
    "the waiters were unfazed and good natured";
    - unflurried, unflustered, unperturbed, unruffled, untroubled, nonplussed [N. Amer, informal]

See also: composed

Encyclopedia: Unfazed