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Adjective: nonchalant  ,nón-shu'laant [N. Amer], nón-shu-lunt [Brit]
  1. Marked by blithe unconcern
    "drove his car with nonchalant abandon"; "was polite in a teasing nonchalant manner";
    - casual, insouciant

See also: unconcerned

Encyclopedia: Nonchalant