Dictionary![]() ![]() per•ni•ciousPronunciation: (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. Obs.evil; wicked. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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