i Register
In some senses, virulent is marked as figuratively. Watch for register when choosing this word.
adj
Of animals, plants, or substances: extremely venomous or poisonous.
Extremely hostile or malicious; intensely acrimonious.
The politicians were virulent in their hatred of the president.
More venemous and much more virulent / Then any poyſoned tode, or any ſerpent.
Of a disease or disease-causing agent: malignant, able to cause damage to the host.
Of a pathogen: replicating within its host cell, then immediately causing it to undergo lysis.