The Collaborative International Dictionary of English v.0.48:

Misteach \Mis*teach"\, v. t. [imp. & p. p. Mistaught; p. pr. &
   vb. n. Misteaching.] [AS. mist[=ae]can.]
   To teach wrongly; to instruct erroneously.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "misteach":
   belie, burlesque, camouflage, caricature, color, corrupt, disguise,
   distort, exaggerate, falsify, garble, misadvise, miscolor,
   misdirect, miseducate, misguide, misinform, misinstruct, mislead,
   misquote, misreport, misrepresent, misstate, mystify, obfuscate,
   obscure, overdraw, overstate, parody, pervert, slant, travesty,
   twist, understate, warp, wrench