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Synonyms
pes·ti·lent (pĕśtə-lənt)

[Middle English, from Old French, from Latin pestilēns, pestilent-, from pestis, pestilence; see pest.]

adjective 

  1. Tending to cause death; deadly.
  2. Likely to cause an epidemic disease.
  3. Infected or contaminated with a contagious disease.
  4. Morally, socially, or politically harmful; pernicious. See synonyms at poisonous
  5. Causing annoyance or disapproval.