Source : Webster's Revised Unabridged Dictionary (1913)

Evilly \E"vil*ly\, adv.
   In an evil manner; not well; ill. [Obs.] ``Good deeds evilly
   bestowed.'' --Shak.

Source : WordNet®

evilly
     adv : in a wicked evil manner; "act wickedly"; "grin evilly" [syn:
            {wickedly}]