The Collaborative International Dictionary of English v.0.48:

Misunderstand \Mis*un`der*stand"\
   (m[i^]s*[u^]n`d[~e]r*st[a^]nd"), v. t. [imp. & p. p.
   Misunderstood (m[i^]s*[u^]n`d[~e]r*st[oo^]d"); p. pr. & vb.
   n. Misunderstanding.]
   To misconceive; to mistake; to miscomprehend; to take in a
   wrong sense.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misunderstood
    adj 1: wrongly understood; "a misunderstood criticism"; "a
           misunderstood question"

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "misunderstood":
   catachrestic, despised, disliked, distorted, eisegetical, garbled,
   lowly, misapprehended, misconceived, misconstrued, misinterpreted,
   misprized, misread, mistaken, out of favor, perverted, thankless,
   unappreciated, uncared-for, unlamented, unmissed, unmourned,
   unpopular, unregretted, unsung, unvalued