Source : Webster's Revised Unabridged Dictionary (1913)

Gladsome \Glad"some\, a.
   1. Pleased; joyful; cheerful.

   2. Causing joy, pleasure, or cheerfulness; having the
      appearance of gayety; pleasing.

            Of opening heaven they sung, and gladsome day.
                                                  --Prior.
      -- {Glad"some*ly}, adv. -- {Glad"some*ness}, n.

            Hours of perfect gladsomeness.        --Wordsworth.

Source : WordNet®

gladsomeness
     n : experiencing joy and pleasure [syn: {gladness}, {gladfulness}]