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Synonyms
ma·lig·nant (mə-lĭǵnənt)

adjective 

  1. Showing great malevolence; disposed to do evil.
  2. Highly injurious; pernicious.
  3. Pathology
    1. Threatening to life; virulent: a malignant disease.
    2. Tending to metastasize; cancerous. Used of a tumor.

derivatives

ma·liǵnant·ly
adverb