misconduct has 7 distinct synonyms spread across 3 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
bad or dishonest management by persons supposed to act on another's behalf
activity that transgresses moral or civil law
“he denied any wrongdoing”
manage badly or incompetently
“The funds were mismanaged”
Synonyms, antonyms and the broader and narrower relations for misconduct come from Princeton University’s WordNet. Full sources and licences.