Webster's English Dictionary

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nonchalant

Cross references:
  1. cool                  
 
non.cha.lant \-'la:nt\ aj [F, fr. OF, fr. prp. of nonchaloir to disregard, 
   fr. non + chalo]ir to concern, fr. L cale-re to be warm - more at LEE : 
   apparently unconcerned or indifferent  - non.cha.lant.ly av