1. extremely annoying or troublesome
Usage: formal
2. carrying or spreading disease; pestilential
Usage: formal; medical

Examples

• The pestiferous mosquitoes made camping unbearable.
• She found her neighbor’s pestiferous dog barking all night.
• The pestiferous conditions in the overcrowded shelter led to illness.
• His pestiferous habit of interrupting annoyed everyone.
• The pestiferous rats carried disease throughout the city.
• The committee dealt with pestiferous delays in the project.