Devil (noun)

1. A supernatural being, typically malevolent, associated with evil, and often represented as an animal or a horned and bearded man.
2. A wicked or evil person; a scoundrel.
3. A difficult or troublesome situation or thing.
4. An evil spirit or demon.
5. A person or thing that is extremely difficult to deal with or get rid of.

Origin:

Old english dēofol, from latin diabolus, from greek diabolos "slanderer, devil", from diaballein "to throw across", from dia- "across" + ballein "to throw".

Examples:

1. The devil is often depicted with horns and a tail.
2. He is a devil of a man.
3. The devil is in the details.
4. The devil possessed the girl.
5. He is a devil to work with.