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Synonyms
per·ni·cious (pər-nĭsh́əs)

[Middle English, from Old French pernicios, from Latin perniciōsus, from perniciēs, destruction, per-, per-, + nex, nec-, violent death.]

adjective 

    1. Tending to cause death or serious injury; deadly: a pernicious virus.
    2. Causing great harm; destructive: pernicious rumors.
  2. Archaic Evil; wicked.

derivatives

per·nícious·ly
adverb
per·nícious·ness
noun