Virulent

1. adjective

   extremely poisonous or injurious; producing venom

   “venomous snakes”

   Similar: deadly, venomous

2. adjective

   infectious; having the ability to cause disease

3. adjective

   harsh or corrosive in tone

   “an acerbic tone piercing otherwise flowery prose”

   Similar: acerb, acerbic, acid, acrid, bitter, blistering