Source : Webster's Revised Unabridged Dictionary (1913)

Greasily \Greas"i*ly\, adv.
   1. In a greasy manner.

   2. In a gross or indelicate manner. [Obs.]

            You talk greasily; your lips grow foul. --Shak.

Source : WordNet®

greasily
     adv : in a greasy manner; "the food was greasily unappetizing"