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Pronunciation:  pur'nishus

WordNet Dictionary
  1. [adj]  working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"
  2. [adj]  exceedingly harmful

PERNICIOUS is a 10 letter word that starts with P.


 Synonyms: baneful, deadly, harmful, insidious, noxious, pestilent, subtle



Webster's 1913 Dictionary
  1. \Per*ni"cious\, a. [L. pernix, -icis.]
    Quick; swift (to burn). [R.] --Milton.
  2. \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.
          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.
Medical Dictionary
 Definition: Destructive, sometimes fatal.
Thesaurus Terms
 Related Terms: 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