The Collaborative International Dictionary of English v.0.48:

Wondrous \Won"drous\, a.
   Wonderful; astonishing; admirable; marvelous; such as excite
   surprise and astonishment; strange.
   [1913 Webster]

         That I may . . . tell of all thy wondrous works. --Ps.
                                                  xxvi. 7.
   [1913 Webster] -- Won"drous*ly, adv. -- Won"drous*ness,
   n.
   [1913 Webster]

         Chloe complains, and wondrously's aggrieved.
                                                  --Granville.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wondrously
    adv 1: (used as an intensifier) extremely well; "her voice is
           superbly disciplined"; "the colors changed wondrously
           slowly" [syn: wonderfully, wondrous, wondrously,
           superbly, toppingly, marvellously, terrifically,
           marvelously]