Pernicious
Pernicious , adjective
[Latin pernix, -icis.]
Quick; swift (to burn). [Rare] — Milton
Pernicious , adjective
[Latin perniciosus, from pernicies destruction, from pernecare to kill or slay outright; per + necare to kill, slay: compare French pernicieux. Compare Nuisance, Necromancy.]
Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked.
Let this pernicious hour
Stand aye accursed in the calendar.
Pernicious to his health.