pestiferous
1. [ adjective ] likely to spread and cause an epidemic disease
Synonyms: pestilential plaguey plaguelike pestilent
Examples:

"a pestilential malignancy in the air"- Jonathan Swift "plaguelike diseases" "plaguey fevers"

Related terms: epidemic
2. [ adjective ] tending to corrupt or pervert
Synonyms: perversive corruptive
Related terms: evil
3. [ adjective ] contaminated with infecting organisms
Synonyms: infected dirty contaminated
Examples:

"dirty wounds" "obliged to go into infected rooms"- Jane Austen

Related terms: septic
4. [ adjective ] causing irritation or annoyance
Synonyms: pestering nettlesome irritating annoying galling plaguey teasing plaguy vexing vexatious pesky bothersome
Examples:

"tapping an annoying rhythm" "a particularly bothersome noise" "found it galling to have to ask permission" "an irritating delay" "nettlesome paperwork" "a pesky mosquito" "swarms of pestering gnats"

Related terms: disagreeable