GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Pernicious , a. [L. pernix, -icis.] Quick; swift (to burn). [R.]
   Milton.
   
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2.       
   Pernicious, a. [L. perniciosus, from pernicies destruction, from pernecare to kill or slay outright; per + necare to kill, slay: cf. F. pernicieux. Cf. Nuisance, Necromancy.] Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked.
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   Let this pernicious hour
   Stand aye accursed in the calendar.
   Shak.
   
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   Pernicious to his health.
   Prescott.
   
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   Syn. -- Destructive; ruinous; deadly; noxious; injurious; baneful; deleterious; hurtful; mischievous.
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   -- Per*ni"cious*ly, adv., -- Per*ni"cious*ness, n.
   1913 Webster