1. appearing as a threat; impending in a menacing way

1. present participle of loom: to appear indistinctly, especially in a large, threatening form
2. present participle of loom: to seem imminent and threatening

Examples

• Dark clouds were looming on the horizon.
• The looming deadline made everyone nervous.
• A tall figure was looming in the doorway.
• The mountain was looming above the village.
• Economic problems are looming for the company.
• She felt a looming sense of dread.
• The building was looming out of the fog.