virulency

/ˈvɪr.jə.lən.si/
noun
  1. The quality or state of being extremely harmful, dangerous, or bitter in effect.
    • The virulency of the disease surprised even the doctors.
    • Her speech was marked by a virulency that shocked the audience.
    • The virulency of the online attacks forced the politician to leave social media.
Antonyms