Adjective: pestiferous pe'sti-fu-rus
- Causing irritation or annoyance
"tapping a pestiferous rhythm on his glass with his fork";
- annoying, bothersome, galling, irritating, nettlesome, pesky [informal], pestering, plaguy, plaguey, teasing, vexatious, vexing, irksome, niggly, dratted [informal], aggravating
- Likely to spread and cause an epidemic disease
"The pestiferous rats carried fleas that spread the plague";
- pestilent, pestilential, plaguey
- Contaminated with infecting organisms
"pestiferous wounds";
- dirty
- Tending to corrupt or pervert
"The pestiferous influence of power was evident in the politician's changing behaviour";
- corruptive, perversive
See also: disagreeable, epidemic, evil, infected, septic