mismanage

verb2

1. •
   To manage an area of responsibility in a way which is inept, incompetent, or dishonest.

   • She mismanaged my finances and left me bankrupt.
2. •
   To behave, in a management capacity, in a manner which is inept, incompetent, or dishonest.

   • The fundamental reason why the company failed is that the CEO and other top managers simply mismanaged.