The Collaborative International Dictionary of English v.0.48:

Misstate \Mis*state"\, v. t.
   To state wrongly; as, to misstate a question in debate. --Bp.
   Sanderson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misstate
    v 1: state something incorrectly; "You misstated my position"

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "misstate":
   belie, burlesque, camouflage, caricature, color, disguise, distort,
   dress up, embellish, embroider, exaggerate, falsify, fudge, garble,
   gild, gloss, gloss over, mask, miscite, miscolor, misquote,
   misreport, misrepresent, misteach, overdraw, overstate, parody,
   pervert, slant, strain, titivate, travesty, trick out, twist,
   understate, varnish, warp, whitewash, wrench