wrongheadedly

from WordNet (r) 3.0 (2006)

wrongheadedly
    adv 1: in a wrongheaded manner

from The Collaborative International Dictionary of English v.0.48

Wrongheaded \Wrong"head`ed\, a.
   Wrong in opinion or principle; having a perverse
   understanding; perverse. -- {Wrong"head`ed*ly}, adv. --
   {Wrong"head`ed*ness}, n. --Macaulay.
   [1913 Webster]