Source : Webster's Revised Unabridged Dictionary (1913)

Disgusting \Dis*gust"ing\, a.
   That causes disgust; sickening; offensive; revolting. --
   {Dis*gust"ing*ly}, adv.

Source : WordNet®

disgustingly
     adv : in a disgusting manner or to a disgusting degree; "the
           beggar was disgustingly filthy" [syn: {distastefully},
           {revoltingly}, {sickeningly}]