Source : Webster's Revised Unabridged Dictionary (1913)

Bountiful \Boun"ti*ful\, a.
   1. Free in giving; liberal in bestowing gifts and favors.

            God, the bountiful Author of our being. --Locke.

   2. Plentiful; abundant; as, a bountiful supply of food.

   Syn: Liberal; munificent; generous; bounteous. --
        {Boun"ti*ful*ly}, adv. -- {Boun"ti*ful*ness}, n.

Source : WordNet®

bountifulness
     n : the property of copious abundance [syn: {amplitude}, {bounty}]