hellishly

from WordNet (r) 3.0 (2006)

hellishly
    adv 1: extremely; "infernally clever"; "hellishly dangerous"
           [syn: {infernally}, {hellishly}]

from The Collaborative International Dictionary of English v.0.48

Hellish \Hell"ish\, a.
   Of or pertaining to hell; like hell; infernal; malignant;
   wicked; detestable; diabolical. "Hellish hate." --Milton. --
   {Hell"ish*ly}, adv. -- {Hell"ish*ness}, n.
   [1913 Webster]