Source : Webster's Revised Unabridged Dictionary (1913)

Marvelously \Mar"vel*ous*ly\, adv.
   In a marvelous manner; wonderfully; strangely.

Source : WordNet®

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