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Definition of pestilent : Pestilential; noxious; pernicious; mischievous.

Synonyms:

mortal, subtle, galling, pestilential, irritating, pestering, bothersome, venomous, dirty, help, annoying, pesky, corruptive, deathly, plaguelike, baneful, nettlesome, plaguey, plaguy, vexing, perversive, virulent, pestiferous, baleful, lethal, insidious, epidemic, harmful, vexatious, teasing, pernicious

ailing, nauseous, diseased, sick, unhealthy, affected, cursed, infected, inflicted, sickly, indisposed, handicapped, infirm, decrepit, disabled, ill

poisonous, septic, contagious, deadly, noxious, contaminated, pathological, malignant, gangrenous, unhygienic, insalubrious, unsanitary, unwholesome, toxic

Usage examples:

• It had faded from my sight, had grown flat as a dogma, uninteresting as " a foul and pestilent congregation of vapours;" the moon had been but a round thing with the sun shining upon it, and the stars were only minding their own business. - "The Seaboard Parish, Complete", George MacDonald.
• The Countess might have some confederate among them- this pestilent English General, perhaps, who had made himself so conspicuous in her defence; or some one of them might throw light upon her movements, upon her conduct during the journey. - "The Rome Express", Arthur Griffiths.
• A companion, to give him still more encouragement, whispered: Don't mind that pestilent fellow! - "Maximina", Armando Palacio Valdés.