abominably

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Abominably \A*bom"i*na*bly\, adv.
   In an abominable manner; very odiously; detestably.
   [1913 Webster]