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Adjective: unruffled  ,ún'rú-fuld
  1. Free from emotional agitation or nervous tension
    "with contented mind and unruffled spirit";
    - unflurried, unflustered, unperturbed, untroubled, unfazed [informal]
  2. (of a body of water) free from disturbance by heavy waves
    "unruffled water";
    - placid, quiet, still, tranquil, smooth

See also: calm, composed