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.
© Webster 1913.