pestilential

the word pestilential traces its lineage directly to the latin noun pestis, which signified a deadly plague, pestilence, or ruin. the latin adjectival suffix -ent- was added to form pestilent-, meaning plague-stricken or unwholesome. this was later adapted into english and further modified with the suffix -ial, which intensifies the adjectival quality. thus, the literal construction "relating to plague" evolved to describe not only things literally causing disease but also anything metaphorically noxious, harmful, or exceedingly troublesome.

Structure: pestil (plague) + ent (adjective suffix) + ial (adjective suffix) pestil (from latin pestis, meaning plague, death, destruction); ent (latin adjectival suffix, meaning being or having a certain quality); ial (latin-derived suffix forming adjectives, meaning relating to or characterized by)