Pes`ti*len"tial (?), a. [Cf. F.
pestilentiel.] 1. Having the nature or
qualities of a pestilence. "Sends the pestilential
vapors." Longfellow.
2. Hence: Mischievous; noxious; pernicious;
morally destructive.
So pestilential, so infectious a thing is
sin.
Jer. Taylor.