1. an evil spirit or devil
2. a person who is extremely skilled at something or very energetic
Usage: informal
3. something that causes persistent trouble or torment

Examples

• The ancient text described demons that haunted the old castle.
• She’s a demon at chess and rarely loses a game.
• He struggled with the demons of addiction for years.
• The horror movie featured terrifying demons from another realm.
• She’s a speed demon on the tennis court.
• His inner demons kept him awake at night.
• The mechanic is a demon with car engines.