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Adjective: baleful  beyl-ful
  1. Indicating evil intent or suggesting tragic developments
    "a baleful look";
    - forbidding, menacing, minacious, minatory, ominous, sinister, threatening
     
  2. Deadly or sinister
    "the Florida eagles have a fierce baleful look";
    - baneful [archaic]

See also: alarming, maleficent