Main Entry: pes·ti·len·tial

Pronunciation: \ˌpes-tə-ˈlen(t)-shəl\

Function: adjective

Date: 14th century

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

— pes·ti·len·tial·ly \-ˈlen(t)-sh(ə-)lē\ adverb