1. something that is extremely ugly, unnatural, or shocking in appearance
2. something that is extremely large, powerful, or impressive in a disturbing way
3. something that is morally wrong or evil

Examples

• The abandoned building had become a monstrosity covered in graffiti and decay.
• The new shopping mall was a concrete monstrosity that dominated the skyline.
• Critics called the sculpture an artistic monstrosity.
• The dictator’s regime committed one monstrosity after another.
• That enormous truck is a monstrosity on the highway.
• The wedding cake was a towering monstrosity with too many decorations.
• How could anyone build such a monstrosity in this beautiful neighborhood?