noun (n)

• (medicine) a malignant state; progressive and resistant to treatment and tending to cause death(noun.state)

  Synonym:
  malignancy
  

  source: wordnet30
• quality of being disposed to evil; intense ill will(noun.attribute)

  Synonym:
  malignancy, malignity
  Antonym:
  benignancy, benignity, graciousness
  

  source: wordnet30
• The state or quality of being malignant; extreme malevolence; bitter enmity; malice; as, malignancy of heart.(noun)

  source: webster1913