What is the meaning of the word "black art"?

Definitions:

  1. a task that is considered difficult or that requires special skills copy to clipboard noun
    • Getting the printer to work is a black art. copy to clipboard
  2. the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world copy to clipboard noun
    • I didn't believe in black arts, but my grandparents did. copy to clipboard

Synonyms: