per·ni·cious /pɝˈnɪʃəs/
  (a.)有害的,有毒的,致命的
  per·ni·cious /pɝˈnɪʃəs/ 形容詞
  惡性的
  Per·ni·cious a.  Quick; swift (to burn). [R.]
  Per·ni·cious, a.  Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked.
  Let this pernicious hour
  Stand aye accursed in the calendar.   --Shak.
     Pernicious to his health.   --Prescott.
  Syn: -- Destructive; ruinous; deadly; noxious; injurious; baneful; deleterious; hurtful; mischievous.
  -- Per*ni*cious*ly, adv., -- Per*ni*cious*ness, n.
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  pernicious
       adj 1: exceedingly harmful [syn: baneful, deadly, pestilent]
       2: working or spreading in a hidden and usually injurious way;
          "glaucoma is an insidious disease"; "a subtle poison"
          [syn: insidious, subtle]