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4 definitions found
 for Pernicious
From The Collaborative International Dictionary of English v.0.48 :

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

From The Collaborative International Dictionary of English v.0.48 :

  Pernicious \Per*ni"cious\, a. [L. pernix, -icis.]
     Quick; swift (to burn). [R.] --Milton.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: exceedingly harmful [syn: baneful, deadly,
             pernicious, pestilent]
      2: working or spreading in a hidden and usually injurious way;
         "glaucoma is an insidious disease"; "a subtle poison" [syn:
         insidious, pernicious, subtle]

From Moby Thesaurus II by Grady Ward, 1.0 :

  57 Moby Thesaurus words for "pernicious":
     baleful, baneful, brutal, corroding, corrosive, corrupting,
     corruptive, counterproductive, damaging, deadly, death-bringing,
     deathful, deathly, deleterious, destructive, detrimental,
     devastating, disadvantageous, disserviceable, distressing, fatal,
     feral, harmful, hurtful, injurious, internecine, killing, lethal,
     malefic, maleficent, malevolent, malign, malignant, miasmatic,
     miasmic, mischievous, mortal, noisome, noxious, ominous,
     pestiferous, pestilent, pestilential, poisonous, prejudicial,
     ruinous, savage, scatheful, sinister, swart, toxic, venenate,
     veneniferous, venenous, venomous, vicious, virulent

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