1. looked angry, sullen, or threatening; frowned or scowled
Usage: past tense and past participle of 'lour'; also spelled 'lowered' in some contexts, though 'loured' is the standard spelling for this sense
2. (of the sky or weather) appeared dark, gloomy, or threatening
Usage: literary or poetic usage

Examples

• She loured at him across the table, clearly displeased.
• The sky loured overhead, suggesting a storm was coming.
• He loured in silence, refusing to speak to anyone.
• Dark clouds loured on the horizon.
• When told the bad news, her face loured with disappointment.