devil-may-care

from WordNet (r) 3.0 (2006)

devil-may-care
    adj 1: cheerfully irresponsible; "carefree with his money";
           "freewheeling urban youths"; "had a harum-scarum youth"
           [syn: {carefree}, {devil-may-care}, {freewheeling},
           {happy-go-lucky}, {harum-scarum}, {slaphappy}]
    2: marked by a carefree unconventionality or disreputableness;
       "a cocktail party given by some...raffish bachelors"- Crary
       Moore [syn: {devil-may-care}, {raffish}, {rakish}]

from The Collaborative International Dictionary of English v.0.48

devil-may-care \devil-may-care\ adj.
   1. cheerfully irresponsible.

   Syn: carefree, happy-go-lucky, harum-scarum, slaphappy.
        [WordNet 1.5]

   2. marked by a carefree unconventionality or
      disreputableness.

   Syn: raffish, rakish.
        [WordNet 1.5]