Source : Webster's Revised Unabridged Dictionary (1913)

Bounteous \Boun"te*ous\, a. [OE. bountevous, fr. bounte bounty.]
   Liberal in charity; disposed to give freely; generously
   liberal; munificent; beneficent; free in bestowing gifts; as,
   bounteous production.

         But O, thou bounteous Giver of all good. --Cowper.
   -- {Boun"te*ous*ly}, adv. -- {Boun"te*ous*ness}, n.

Source : WordNet®

bounteously
     adv : in a bountiful manner [syn: {bountifully}, {plentifully}, {plenteously}]