Source : Webster's Revised Unabridged Dictionary (1913)

Abominably \A*bom"i*na*bly\, adv.
   In an abominable manner; very odiously; detestably.

Source : WordNet®

abominably
     adv 1: in an offensive and hateful manner; "I don't know anyone who
            could have behaved so abominably" [syn: {detestably},
            {repulsively}, {odiously}]
     2: in a terrible manner; "she sings terribly" [syn: {terribly},
         {atrociously}, {awfully}, {abysmally}, {rottenly}]