[syn: devil-may-care, raffish, rakish]
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]
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]