D defs.my
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Entry 2 senses · 2 variants Webster, 1913

Pernicious

/pẽrn-ĭsh'-əs/ · Per·ni·cious · IPA /pɚˈnɪʃəs/
01 a. Quick; swift (to burn).
  1. 1.
    Quick; swift (to burn).[R.]
02 a. Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked.
  1. 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.
Syn. Destructive; ruinous; deadly; noxious; injurious; baneful; deleterious; hurtful; mischievous.