The Collaborative International Dictionary of English v.0.48:
Greasily \Greas"i*ly\, adv. 1. In a greasy manner. [1913 Webster] 2. In a gross or indelicate manner. [Obs.] [1913 Webster] You talk greasily; your lips grow foul. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
greasily adv 1: in a greasy manner; "the food was greasily unappetizing"