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Adjective: hideous  hi-dee-us
  1. So extremely ugly as to be terrifying
    "a hideous scar";
    - repulsive
     
  2. Grossly offensive to decency or morality; causing horror
    "a hideous pattern of injustice";
    - horrid, horrific, outrageous

See also: offensive, ugly, unbeautiful

Encyclopedia: Hideous