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Definition of pernicious:

  1. Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked.
  2. Quick; swift ( to burn).


lethal, pestilential, perverting, unhealthful, injurious, detrimental, poisonous, evil, elusive, insidious, mischievous, insalubrious, deleterious, unwholesome, noxious, pestilent, mortal, ruinous, bad, noisome, baleful, virulent, venomous, baneful, deadly, pestiferous, harmful, foul, help, subtle, destructive, hurtful, plaguey, malignant, deathly.

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