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Search Result for "pernicious": 
Wordnet 3.0

ADJECTIVE (2)

1. exceedingly harmful;
[syn: baneful, deadly, pernicious, pestilent]

2. working or spreading in a hidden and usually injurious way;
- Example: "glaucoma is an insidious disease"
- Example: "a subtle poison"
[syn: insidious, pernicious, subtle]


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, 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]
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]
WordNet (r) 3.0 (2006):

pernicious 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]
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