1. in an ugly manner; in a way that is unpleasant to look at
2. in an unpleasant, disagreeable, or threatening way

Examples

• The old building loomed uglily against the gray sky.
• She grimaced uglily when she tasted the bitter medicine.
• The scar stretched uglily across his forearm.
• He spoke uglily to the waiter, embarrassing everyone at the table.
• The graffiti was uglily scrawled across the pristine wall.
• The situation developed uglily, with both sides making threats.