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Adjective: frightful  frIt-ful
  1. Provoking horror
    "a frightful crime of decapitation";
    - atrocious, horrifying, horrible, ugly
     
  2. Extreme in degree, extent, amount or impact
    "in a frightful hurry"; "spent a frightful amount of money";
    - terrible, awful, tremendous
     
  3. Extremely distressing
    "a frightful mistake";
    - fearful

See also: alarming, bad, extraordinary

Encyclopedia: Frightful