1. 营私舞弊;玩忽职守;渎职
If you accuse someone of malpractice, you are accusing them of breaking the law or the rules of their profession in order to gain some advantage for themselves.

1. a wrongful act that the actor had no right to do
improper professional conduct

e.g. he charged them with electoral malpractices

2. professional wrongdoing that results in injury or damage

e.g. the widow sued his surgeon for malpractice