virulent in Bulgarian
virulent in Bulgarian
силно отровен
Of animals, plants, or substances: extremely venomous or poisonous.
враждебен
(figurative) Extremely hostile or malicious; intensely acrimonious.
злобен
(figurative) Extremely hostile or malicious; intensely acrimonious.
болестотворен
(medicine) Of a disease or disease-causing agent: malignant, able to cause damage to the host.