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Adjective: pestiferous  pe'sti-fu-rus
  1. Contaminated with infecting organisms
    "pestiferous wounds";
    - dirty
     
  2. Likely to spread and cause an epidemic disease
    - pestilent, pestilential, plaguey
     
  3. Tending to corrupt or pervert
    - corruptive, perversive
     
  4. 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]

See also: disagreeable, epidemic, evil, infected, septic