pestilent
/ˈpɛstələnt/
adjective
- Causing or likely to cause a deadly infectious disease; plague-like.
- Medieval doctors wore masks to protect themselves from pestilent air.
- The swamp was considered a pestilent place, full of fever-carrying mosquitoes.
- The pestilent rats spread disease through the crowded city.
- Annoying or harmful in a persistent way; troublesome.
- She found the constant spam emails to be a pestilent nuisance.
- The pestilent noise from the construction site made it impossible to concentrate.
- My little brother has a pestilent habit of leaving his toys all over the floor.
Antonyms