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Adjective: abhorrent  ub'hor-unt or ub'hór-unt [N. Amer], ub'hór-unt [Brit]
  1. Causing strong moral disgust or loathing
    "an abhorrent deed";
    - detestable, obscene, repugnant, repulsive, absonant [archaic]

See also: despicable, loathsome, nauseating, offensive, sick, sickening, slimy, ugly, unsavory [US], unsavoury [Brit, Cdn], unworthy, vile, worthless, wretched