pestilential (adjective)

1. The movie portrayed a post-apocalyptic world where a pestilential virus had wiped out most of humanity.

2. The town's inhabitants believed that the pestilential rain was a punishment from a wrathful deity.

3. In the horror novel, the protagonist encountered a pestilential creature that turned its victims into mindless zombies.

4. Why did the pestilential mosquito go to the doctor? It wanted to know if it had malaria!