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Adjective: devil-may-care  'de-vul,mey'kehr
  1. Cheerfully irresponsible
    "devil-may-care with his money";
    - carefree, freewheeling, happy-go-lucky, harum-scarum, slaphappy [informal]
  2. Marked by a carefree unconventionality or disreputableness
    "a cocktail party given by some...devil-may-care bachelors";
    - raffish, rakish

See also: irresponsible, unconventional

Encyclopedia: Devil-may-care