1. the quality or state of being pestiferous; the characteristic of being harmful, destructive, or annoying
Usage: formal; often used to describe something that spreads harm or causes widespread trouble

Examples

• The pestiferousness of the invasive species threatened the entire ecosystem.
• Citizens complained about the pestiferousness of the new factory's pollution.
• The pestiferousness of misinformation spread rapidly through social media.
• Historians documented the pestiferousness of the plague across medieval Europe.
• The pestiferousness of his behavior made him unwelcome in polite society.