1. the quality or state of being extremely ugly or repulsive in appearance
2. the quality of being morally or ethically offensive or abhorrent

Examples

• The hideousness of the villain's scarred face made children turn away in fear.
• Critics condemned the hideousness of the crime and called for swift justice.
• The old building's hideousness was evident in its crumbling walls and broken windows.
• She was struck by the hideousness of the pollution in the once-beautiful river.
• The hideousness of his behavior toward others shocked everyone who knew him.
• The artist deliberately exaggerated the hideousness of the monster in the painting.