pestiferous

Pestiferous is an adjective that describes something bearing or spreading pestilence or disease, or more generally something harmful, troublesome, or pernicious. It can refer to a place, person, or influence that is contagious or morally corrupting. The sense is often associated with historical or literary contexts rather than everyday modern usage.

The term derives from Latin pestiferus, from pestis plague + -fer bearing. It entered English in the early modern period and has remained a formal, somewhat archaic word. In contemporary writing, pestilential or pernicious are more common, while pestiferous emphasizes the idea of actively carrying or spreading harm, especially disease.

In historical narratives, pestiferous regions or cities are described as places prone to outbreaks of disease; pestiferous rumors describe harmful, spreading misinformation. The word can also describe persons whose influence is harmful or corrupting. Because of its formal tone, pestiferous is usually found in literature, historical accounts, or rhetorical prose rather than technical or everyday prose.