pestiferous (adj.)

mid-15c., "mischievous, pernicious," figurative use of Latin pestiferus "that brings plague or destruction," variant of pestifer "bringing plague, destructive, noxious," from pestis "plague" (see pest) + ferre "carry," from PIE root *bher- (1) "to carry," also "to bear children." Related: Pestiferously; pestiferousness.

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