1. pestilent(s = adj.all) baneful, deadly, pernicious - exceedingly harmful;
Derived form noun pestilence3
2. pestilent(s = adj.all) pestiferous, pestilential, plaguey - likely to spread and cause an epidemic disease; "a pestilential malignancy in the air"; "plaguey fevers"
Derived form noun pestilence2
Pestilential; noxious; pernicious; mischievous. Shak. [1913 Webster]
pestilent, adj.
1 destructive to life, deadly.
2 harmful or morally destructive.
3 colloq. troublesome; annoying.
Derivative:
pestilently adv.
Etymology:
L pestilens, pestilentus f. pestis plague
N insalubrity, unhealthiness, nonnaturals, plague spot, malaria, death in the pot, contagion, toxicity, insalubrious, unhealthy, unwholesome, noxious, noisome, morbific, morbiferous, mephitic, septic, azotic, deleterious, pestilent, pestiferous, pestilential, virulent, venomous, envenomed, poisonous, toxic, toxiferous, teratogenic, narcotic, contagious, infectious, catching, taking, epidemic, zymotic, epizootic, innutritious, indigestible, ungenial, uncongenial, deadly.