demon - definition and synonyms

noun 

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/ˈdiːmən/
singulardemon
pluraldemons
  1. 1
    [countable] an evil spirit
  2. 2

    demons

    [plural] things that worry someone or make them unhappy
    inner demons:

    He was still wrestling with his inner demons.

  3. 3
    [countable] someone who is extremely good at something

    She’s a demon at chess.