Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
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