形容詞 pestiferous:

1. contaminated with infecting organisms- Jane Austen
   同義詞：contaminated, dirty
2. likely to spread and cause an epidemic disease
   同義詞：pestilent, pestilential, plaguey
3. tending to corrupt or pervert
   同義詞：corruptive, perversive
4. causing irritation or annoyance
   同義詞：annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, plaguy, plaguey, teasing, vexatious, vexing

pes.tif.er.ous

adj.（形容詞）

Producing or breeding infectious disease.
傳播疾病的，引起瘟疫的：產(chǎn)生或繁殖傳染病的
Infected with or contaminated by an epidemic disease.
染上瘟疫的：患有傳染病或被傳染病污染的
Morally evil or deadly; pernicious.
道德敗壞的，致命的；有害的
Bothersome; annoying.
麻煩的；惱人的

來源：
Middle English
中古英語
from Latin pestiferus
源自 拉丁語 pestiferus
variant of pestifer
pestifer的變體
pestis [pestilence] * see pest
pestis [瘟疫，有害物] *參見 pest
-fer [-fer]
-fer [后綴，表示.媒介，負(fù)荷，生產(chǎn).之意]

【引伸】
pestif.erously
adv.（副詞）
pestif.erousness
n.（名詞）