'Perniciousness' definitions:

Definition of 'perniciousness'

(from WordNet)
noun
Grave harmfulness or deadliness [syn: perniciousness, toxicity]

Definition of 'Perniciousness'

From: GCIDE
  • 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, Necromancy.] 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]

Words containing 'Perniciousness'