virulent

"Cancer is not infectious."

"He is a student of life."

"The politicians debated the new law in the city council meeting. "

"My sister is very helpful, especially when it comes to organizing things. "

"The president of the student council used last year's debate as a precedent for this year's election rules. "

"The school bully was a malignant influence on the younger students. "

"The hostile between the two families made any peaceful solution impossible. "

"He pursued his studies intensely."

"The villain tricked him into drinking the venomous concoction."

"The tomato plants had some kind of disease that left their leaves splotchy and fruit withered."

"The divorce proceedings became acrimonious, filled with angry accusations and bitter arguments. "

"The lightning caused thunder."