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malignant

malignant - adjective

  1. Characterized by intense ill will or spite: black, despiteful, evil, hateful, malevolent, malicious, malign, mean, nasty, poisonous, spiteful, venomous, vicious, wicked. Slang bitchy. See attitude.
  2. Extremely destructive or harmful: baneful, deadly, noxious, pernicious, pestilent, pestilential, virulent. See help.