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Adjective: ominous  ó-mi-nus
  1. Indicating evil intent or suggesting tragic developments
    "ominous rumblings of discontent";
    - baleful, forbidding, menacing, minacious, minatory, sinister, threatening
  2. Presaging ill fortune
    "a dead and ominous silence prevailed";
    - ill, inauspicious

See also: alarming, unpropitious