Source : Webster's Revised Unabridged Dictionary (1913)

Gladful \Glad"ful\, a.
   Full of gladness; joyful; glad. [R.] -- {Glad"ful*ness}, n.
   [R.] --Spenser.

         It followed him with gladful glee.       --Spenser.

Source : WordNet®

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