ominous

Synonyms: apocalyptic augural baleful baneful clouded dangerous dark dire direful dismal doomed doomful fateful fearful forbidding gloomy grim haunting hostile ill-boding ill-fated impending inauspicious inhospitable lowering malefic malificent malign minatory perilous portentous precursive premonitory presaging prescient prophetic sinister suggestive threatening unfriendly unlucky unpromising unpropitious

Antonyms: auspicious happy lucky promising propitious