出典:Wiktionary
Mid 15th century, in sense “mischievous, pernicious”, from Latin pestiferus (“bearing plague”), from pestifer, from pestis (“plague”) + ferre (“carry”) (see infer).[1]
By surface analysis, pest + -i- (“bearing, carrying”) + -ferous.
pestiferous (comparative more pestiferous, superlative most pestiferous)