pestilential
adjective
pes·ti·len·tial
ˌpe-stə-ˈlen(t)-shəl
1
a
: causing or tending to cause pestilence : deadly
b
: of or relating to pestilence
2
: morally harmful : pernicious
3
: giving rise to vexation or annoyance : irritating
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Merriam-Webster unabridged
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