The Collaborative International Dictionary of English v.0.48:

Mismanagement \Mis*man"age*ment\, n.
   Wrong or bad management; as, he failed through mismagement.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mismanagement
    n 1: management that is careless or inefficient; "he
         accomplished little due to the mismanagement of his
         energies" [syn: mismanagement, misdirection]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "mismanagement":
   abuse, abuse of office, bad policy, befoulment, conversion,
   corrupt administration, debasement, defalcation, defilement,
   desecration, diversion, embezzlement, fouling, impolicy,
   inexpedience, inexpediency, maladministration, malfeasance,
   malpractice, malversation, misadministration, misapplication,
   misappropriation, misconduct, misdirection, misemployment,
   misfeasance, misgovernment, misguidance, mishandling, misrule,
   misusage, misuse, neglect, negligence, nonfeasance, omission,
   peculation, perversion, pilfering, pollution, poor stewardship,
   profanation, prostitution, violation, wrongdoing