transferred. Of the clouds, sky, weather, etc.: Gloomy, dark, threatening. Sometimes figurative of attendant circumstances. Occasionally…

Of the sky, clouds, etc.: overcast with dark clouds; lowering, gloomy.

Of the sky, etc.: Dull, gloomy, threatening.

Suggestive of evil or malevolence; that evokes a sense of dread or foreboding; ominous, threatening, menacing. Of a material or immaterial thing.