pestiferous
adjective
1. contaminated with infecting organisms
Similar word(s): infected, septic, dirty
2. likely to spread and cause an epidemic disease
Similar word(s): epidemic, pestilent, pestilential, plaguey
3. tending to corrupt or pervert
Similar word(s): evil, corruptive, perversive
4. causing irritation or annoyance
Similar word(s): disagreeable, annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, plaguey, plaguy, teasing, vexatious, vexing