形容詞 pestilent:

1. exceedingly harmful
   同義詞：baneful, deadly, pernicious
2. likely to spread and cause an epidemic disease
   同義詞：pestilential, pestiferous, plaguey

pes.ti.lent

adj.（形容詞）
Tending to cause death; deadly.
致命的；致死的：易引起死亡的；致命的
Likely to cause an epidemic disease.
會傳染的，傳染病的：有可能引起傳染病的
Infected or contaminated with a contagious disease.
得了傳染病的：患有或被染上傳染病的
Morally, socially, or politically harmful; pernicious.See Synonyms at poisonous
傷風敗俗的，危害社會的：道德上、社會上或政治有害的；有害的參見 poisonous
Causing annoyance or disapproval.
討厭的，厭煩的：引起煩惱或異議的

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin pestilôns pestilent-
源自 拉丁語 pestilôns pestilent-
from pestis [pestilence] * see pest
源自 pestis [有害的事物，瘟疫] *參見 pest