Ominous

1.

(like an omen of bad luck; threatening evil) ដែលគំរាមកំហែង
Example: Those black clouds are look a bit ominous.

1.

Of or pertaining to an omen or to omens; being or exhibiting an omen; significant; portentous; -- formerly used both in a favorable and unfavorable sense; now chiefly in the latter; foreboding or foreshowing evil; inauspicious; as, an ominous dread.

1.

dire, forbidding, foreboding, gloomy, grim, menacing, portentous, threatening