Pernicious

a.	1.	Quick; swift (to burn).
	1.	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.

Adj.	1.	pernicious - exceedingly harmful Synonyms: baneful, pestilent, deadly
	2.	pernicious - working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison" Synonyms: insidious, subtle

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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