[1] : The Collaborative International Dictionary of English v.0.48

happy \hap"py\ ha^p"py^, a. compar. happier
   -pi^~er; superl. happiest. from hap chance.
   1. favored by hap, luck, or fortune; lucky; fortunate;
      successful; prosperous; satisfying desire; as, a happy
      expedient; a happy effort; a happy venture; a happy omen.
      1913 webster

            chymists have been more happy in finding experiments
            than the causes of them.              --boyle.
      1913 webster

   2. experiencing the effect of favorable fortune; having the
      feeling arising from the consciousness of well-being or of
      enjoyment; enjoying good of any kind, as peace,
      tranquillity, comfort; contented; joyous; as, happy hours,
      happy thoughts.
      1913 webster

            happy is that people, whose god is the lord. --ps.
                                                  cxliv. 15.
      1913 webster

            the learned is happy nature to explore,
            the fool is happy that he knows no more. --pope.
      1913 webster

   3. dexterous; ready; apt; felicitous.
      1913 webster

            one gentleman is happy at a reply, another excels in
            a in a rejoinder.                     --swift.
      1913 webster

   happy family, a collection of animals of different and
      hostile propensities living peaceably together in one
      cage. used ironically of conventional alliances of persons
      who are in fact mutually repugnant.

   happy-go-lucky, trusting to hap or luck; improvident;
      easy-going. "happy-go-lucky carelessness." --w. black.
      1913 webster
see also:
happier happiest hap happy family happy-go-lucky 

[2] : WordNet (r) 2.0

happy-go-lucky
     adj : cheerfully irresponsible; "carefree with his money";
           "freewheeling urban youths"; "had a harum-scarum youth"
           syn: carefree, devil-may-care, freewheeling, harum-scarum,
            slaphappy
see also:
carefree devil-may-care freewheeling harum-scarum slaphappy 

Happygolucky >> H Words
Happygolucky, definition of term: Happygolucky
happygolucky_pag1.html