WordNet (r) 3.0 (2006):

misguided
    adj 1: poorly conceived or thought out; "an ill-conceived plan
           to take over the company" [syn: ill-conceived,
           misguided]
    2: wrong in e.g. opinion or judgment; "well-meaning but
       misguided teachers"; "a mistaken belief"; "mistaken identity"
       [syn: misguided, mistaken]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "misguided":
   botched, bungled, butchered, erroneous, fallacious, foolish,
   fumbled, ill-advised, ill-considered, ill-contrived, ill-devised,
   ill-done, ill-executed, ill-gauged, ill-judged, ill-managed,
   impolitic, imprudent, inadvisable, inconsiderate, indiscreet,
   inexpedient, injudicious, insensate, irrational, mindless,
   misadvised, misconducted, misdirected, misinformed, misinstructed,
   misled, mismanaged, misplaced, mistaken, mistaught, muffed,
   murdered, myopic, negligent, reasonless, reckless, senseless,
   shortsighted, spoiled, thoughtless, unadvised, uncalled-for,
   unconsidered, undiscerning, unforeseeing, unreasonable,
   unreflecting, unreflective, unseeing, unsensible, unsound,
   unthinking, unthoughtful, unwise, witless, wrong