Pestiferous (adjective)
pestiferous [pe-stif-er-uh s]

adjective
1. bringing or bearing disease.
2. pestilential.
3. pernicious; evil.
4. Informal. mischievous; troublesome or annoying.

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Origin: 1425-75; late Middle English < Latin pestiferus plague-bringing, equivalent to pesti- (stem of pestis) pest + -ferus -ferous

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