mismanage

gestionar mal

to manage something in a very poor or incompetent way

gestionar algo de una manera muy deficiente o incompetente

gestionar completamente mal

to manage something poorly in every aspect or to the fullest degree

gestionar algo mal en todos los aspectos o en el mayor grado

gestionar de forma negligente

to manage something in an obviously and unacceptably bad way

gestionar algo de una manera obviamente e inaceptablemente mala