A scoundrel is a person who is not honest and often does bad things to other people.
The word scoundrel is not a nice word. It makes people think of someone who is not good.
Examples:
The scoundrel stole my lunch money.
I don't want to play with that scoundrel.
The scoundrel always lies.
That scoundrel tried to take my toy!
The scoundrel is always causing trouble.
Beware of the scoundrel in the dark alley.