DictionarypestilentDisease-causing
adjective

pestilent

PES-tuh-lunt/ˈpɛstələnt/

Causing or spreading serious disease.

The pestilent refuse attracts flies that carry contamination to the uncovered food.

A fly-infested heap of rotting food in an overflowing refuse pail stands immediately beside uncovered bread and cut fruit; flies cluster on both the decaying waste and the ready-to-eat food, making the disease-spreading hazard visible.
Etymology

Latin pestilens meant “infected” or “unhealthy.” English extended this disease-related danger to things harmful to health or morals, giving the word a broader sense of deadly or damaging.

In context

Enhanced Public Domain295:31
gloomy lagoons stretched along its low coasts exhaling a pestilent odor while fever hovered over its sleepy Waters
1900s Satire Audiobook: Anatole France - Penguin Island

More examples

  • Workers wear protective gear while handling pestilent waste.
  • The team tests the water for pestilent bacteria.
  • The city works to control its pestilent rats.

Forms

pestilent

pestilence noun — A deadly epidemic or infectious disease.

Similar words

pestilential
Closely matches pestilent, especially for disease-ridden places or conditions.
pathogenic
Specifically describes organisms or substances capable of causing disease.
infectious
Emphasizes the ability to spread infection, rather than disease severity.