Definitions:

1. A person who behaves badly or breaks the law, often with malicious intent. NOUN
   • He was branded a miscreant and expelled from the community after he was caught spreading malicious rumors.
2. Used to describe someone who engages in immoral, dishonest, or antisocial behavior, or who commits crimes or wrongdoing. NOUN
   • The police arrested the miscreant who had been vandalizing the neighborhood park.

Synonyms:

• criminal
• crook
• delinquent
• felon
• hoodlum
• offender
• reprobate
• ruffian
• savage
• scoundrel
• trangressor