1. superlative form of ugly: most unpleasant or repulsive in appearance
2. superlative form of ugly: most unpleasant, disagreeable, or morally reprehensible

Examples

• That was the ugliest building in the entire city.
• She wore her ugliest dress to the costume party.
• The storm brought out the ugliest weather we’d seen all year.
• His behavior during the argument was the ugliest I’d ever witnessed.
• The scandal revealed the ugliest side of politics.
• Of all the paintings, this one is definitely the ugliest.