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Adjective: virulent  vir-(y)u-lunt
  1. Extremely poisonous or injurious; producing venom
    "a virulent insect bite";
    - deadly, venomous
  2. Harsh or corrosive in tone
    - acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous [N. Amer], sulphurous [Brit, Cdn], vitriolic, acidulous, sulphureous [Brit]
  3. Infectious; having the ability to cause disease

See also: deadly, highly infective, toxic, unpleasant

Antonym: avirulent

Encyclopedia: Virulent