pestilent

Adjective
  1. Exceedingly harmful (synset 301615857)
    similar to: noxious - injurious to physical or mental health
    same as: baneful, deadly, pernicious
  2. Likely to spread and cause an epidemic disease (synset 301430206)
    "a pestilential malignancy in the air"; "plaguey fevers"
    similar to: epidemic - (especially of medicine) of disease or anything resembling a disease; attacking or affecting many individuals in a community or a population simultaneously
    same as: pestiferous, pestilential, plaguey

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