pestiferous
adj.
contaminated with infecting organisms
dirty wounds|obliged to go into infected rooms
Synonym: dirty
adj.
likely to spread and cause an epidemic disease
a pestilential malignancy in the air|plaguey fevers
adj.
tending to corrupt or pervert
adj.
causing irritation or annoyance
tapping an annoying rhythm on his glass with his fork|aircraft noise is particularly bothersome near the airport|found it galling to have to ask permission|an irritating delay|nettlesome paperwork|a pesky mosquito|swarms of pestering gnats|a plaguey newfangled safety catch|a teasing and persistent thought annoyed him|a vexatious child|it is vexing to have to admit you are wrong