virulent

/ˈvɪr.jə.lənt/
adjective
  1. (of a disease or poison) extremely severe or harmful in a rapid way.
    • Doctors worked to contain the virulent outbreak before it reached the city.
    • The venom of that snake is highly virulent and can kill within hours.
    • A virulent strain of the flu spread through the school in just a few days.
  2. Full of bitter, harsh, or angry feelings; very hostile.
    • The critic wrote a virulent review that attacked the movie's director personally.
    • Online forums can become filled with virulent arguments over small disagreements.
    • His virulent comments during the debate offended many listeners.
Antonyms