Virulent
Part of speech: adjective
Definition: Of a disease or disease-causing agent, highly infectious, malignant, or deadly. Hostile to the point of being venomous; intensely acrimonious.
Deadly
Part of speech: adjective
Definition: lethalvery accurate (of aiming with a bow, firearm, etc.)very boringexcellent, awesome, cool
Part of speech: adverb
Definition: Fatally, mortally.In a way which suggests death.
Example sentence: The most deadly fruit is borne by the hatred which one grafts on an extinguished friendship.