(1) Activity that transgresses moral or civil law
"He denied any wrongdoing"
(2) Bad or dishonest management by persons supposed to act on another's behalf
(3) Manage badly or incompetently
"The funds were mismanaged"
(4) Behave badly
"The children misbehaved all morning"
- Bad behavior.
- The student was threatened with a £2000 fine and banned from using the university's computing resources for two weeks due to gross misconduct on Wikipedia