merrily

from WordNet (r) 3.0 (2006)

merrily
    adv 1: in a joyous manner; "they shouted happily" [syn:
           {happily}, {merrily}, {mirthfully}, {gayly}, {blithely},
           {jubilantly}] [ant: {unhappily}]

from The Collaborative International Dictionary of English v.0.48

Merrily \Mer"ri*ly\, adv. [From {Merry}.]
   In a merry manner; with mirth; with gayety and laughter;
   jovially. See {Mirth}, and {Merry}.
   [1913 Webster]

         Merrily sing, and sport, and play.       --Granville.
   [1913 Webster]