pestilential

adjective7

1. •
   Of or relating to pestilence or plague.
2. •
   Producing, spreading, promoting or infected with pestilence; causing infection. (of people, animals, places or substances)

   • What do you fear? Why do you shun me thus. […] I am not Pestilential, nor Leaprous. — 1675
3. •
   Spreading in the manner of pestilence. (of illnesses)

   • A long sicknesse will weary friends at last; but a pestilentiall sicknes auerts them from the beginning. — 1624
4. •
   Caused by pestilence. (of symptoms)

   • The Scab, the Stench, and the Burning are terrible pestilential Symptoms, — 1752
5. •
   During which pestilence spreads. (of a period of time)

   • Now this pestilentiall Summer being well spent, upon the approach of the Winter, and decrease of the Sicknesse, the King […] drawes nearer to the City of London, — 1651
6. •
   (figurative) Causing irritation or annoyance.

   • There’s the pestilential nuisances who write for autographs […] They’d none of ’em be missed! — 1885
7. •
   (figurative) Having a harmful moral effect (especially one that is believed to spread in the manner of pestilence).

   • But as the Poisons of the deadliest kind Are to their own unhappy Coasts confin’d, […] So Presby’try and Pestilential Zeal Can only flourish in a Common-weal. — 1687