wrongheaded

from WordNet (r) 3.0 (2006)

wrongheaded
    adj 1: obstinately perverse in judgment or opinion; "a
           wrongheaded policy"

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]

from Moby Thesaurus II by Grady Ward, 1.0

48 Moby Thesaurus words for "wrongheaded":
      Boeotian, asinine, balky, beef-brained, beef-witted, blockish,
      bovine, bullheaded, cantankerous, chumpish, cloddish, contrary,
      cowish, crass, cross-grained, dense, difficult, doltish, dullard,
      dumb, duncical, duncish, fat, froward, gross, headstrong,
      ineducable, irascible, klutzy, lumpish, mulish, oafish, opaque,
      ornery, perverse, pigheaded, restive, self-willed, sottish,
      stiff-necked, stubborn, stuffy, stupid, sulky, sullen, thick,
      unteachable, wayward