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

See also: hideously, hideousness, offensive, ugly

Encyclopedia: Hideous