villain
US /ˈvɪl.ən/
UK /ˈvɪl.ən/

1.
a character in a play, film, or story who is evil and causes problems for the main character
:
•
The superhero finally defeated the villain.
•
Every good story needs a compelling villain.
2.
a person who is guilty or responsible for a crime or misdeed
:
•
The police are still searching for the villain who committed the robbery.
•
He was portrayed as the villain in the whole scandal.