Source : Webster's Revised Unabridged Dictionary (1913)

Blithesome \Blithe"some\ (-s[u^]m), a.
   Cheery; gay; merry.

         The blithesome sounds of wassail gay.    --Sir W.
                                                  Scott.
   -- {Blithe"some*ly}, adv. -- {Blithe"some*ness}, n.