Definitions:

1. An action that is morally or legally wrong. NOUN
   • He regretted his misdeed and tried to make amends by apologizing to those he had hurt.
2. Refers to a bad or inappropriate act. NOUN
   • Misdeeds in the past can sometimes come back to haunt a person later in life.
3. Term often used to describe actions that go against accepted standards of behavior or ethics. NOUN
   • She was punished for her misdeed, even though she had not intended to cause harm.

Synonyms:

• misbehavior
• misconduct
• offense
• transgression
• violation
• wrongdoing