Pĕs'ti-lĕn′tial, a.

(-lēn′shal), a. [Fr. pestilentiel, Pr., Sp., & Pg. pestilencial, It. pestilenziale.]

1. Producing or tending to produce the pest, the plague, or other infectious disease.
2. Hence, noxious; seriously troublesome; positively mischievous.