1. in a manner relating to or characteristic of cancer; in a way that spreads or grows like cancer
Usage: often used figuratively to describe harmful, destructive, or rapidly spreading conditions or behaviors

Examples

• The corruption spread cancerously through the organization.
• Misinformation grew cancerously across social media platforms.
• The disease progressed cancerously, affecting multiple organs.
• Prejudice had taken root cancerously in the community.
• The tumor expanded cancerously despite treatment efforts.