Source : Webster's Revised Unabridged Dictionary (1913)

Misinform \Mis`in*form"\, v. t.
   To give untrue information to; to inform wrongly.

Misinform \Mis`in*form"\, v. i.
   To give untrue information; (with against) to calumniate.
   [R.] --Bp. Montagu.

Source : WordNet®

misinform
     v : give false or misleading information to [syn: {mislead}]