Source : Webster's Revised Unabridged Dictionary (1913)

Abysmally \A*bys"mal*ly\, adv.
   To a fathomless depth; profoundly. ``Abysmally ignorant.''
   --G. Eliot.

Source : WordNet®

abysmally
     adv : in a terrible manner; "she sings terribly" [syn: {terribly},
            {atrociously}, {awfully}, {abominably}, {rottenly}]