poisonously

from WordNet (r) 3.0 (2006)

poisonously
    adv 1: in a very malevolent manner [syn: {poisonously},
           {venomously}]

from The Collaborative International Dictionary of English v.0.48

Poisonous \Poi"son*ous\, a.
   Having the qualities or effects of poison; venomous; baneful;
   corrupting; noxious. --Shak. -- {Poi"son*ous*ly}, adv. --
   {Poi"son*ous*ness}, n.
   [1913 Webster]