pestilent

Causing or likely to cause epidemic disease.

Infectious or epidemic.

Tending to cause death; deadly.

Morally or socially harmful; pernicious.

Causing annoyance or disapproval.

Excessively; intolerably. Compare pestilent, a., 3.

Producing or tending to produce infectious disease; pestilential; pestiferous.

Mischievous; noxious; pernicious; hurtful to health or morals.

Troublesome; mischievous; making mischief or disturbance: often used humorously: as, a pestilent fellow.