Source : Webster's Revised Unabridged Dictionary (1913)

Mismanage \Mis*man"age\, v. t. & i.
   To manage ill or improperly; as, to mismanage public affairs.

Source : WordNet®

mismanage
     v : manage badly or incompetently; "The funds were mismanaged"
         [syn: {mishandle}, {misconduct}]