PESTILENTIALLY
Etymology
Adverb
pestilentially (comparative more pestilentially, superlative most pestilentially)
In a pestilential manner; with pestilence.
Source: Wiktionary
Pes`ti*len"tial*ly, adv.
Definition: Pestilently.
PESTILENTIAL
Pes`ti*len"tial, a. Etym: [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.
Source: Webster’s Unabridged Dictionary 1913 Edition