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Meaning of pernicious

per•ni•cious

Pronunciation: (pur-nish'us), [key]
— adj.
  1. causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings; a pernicious lie.
  2. deadly; fatal: a pernicious disease.
  3. evil; wicked.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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