1. the quality of being deliberately cruel or violent
2. the quality of being spiteful or malicious in behavior or speech

Examples

• The viciousness of the attack shocked the entire community.
• She was surprised by the viciousness of his criticism.
• The dog’s viciousness made it dangerous to approach.
• The viciousness in her voice revealed her true feelings.
• The referee condemned the viciousness of the foul play.
• His viciousness toward his coworkers created a hostile environment.
• The viciousness of the storm left widespread damage.