The Collaborative International Dictionary of English v.0.48:
Evilly \E"vil*ly\, adv. In an evil manner; not well; ill. [Obs.] "Good deeds evilly bestowed." --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
evilly adv 1: in a wicked evil manner; "act wickedly"; "grin evilly" [syn: wickedly, evilly]