pestilential

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pes·ti·len·tial / ˌpestəˈlenshəl/ • adj. harmful or destructive to crops or livestock: these pestilential lichens flourish only in unpolluted air. ∎ dated of, relating to, or tending to cause infectious diseases: you shouldn't be out on a pestilential night like this. ∎ inf. annoying: what a pestilential man!DERIVATIVES: pes·ti·len·tial·ly adv.

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