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Adjective: detestable  di'tes-tu-bul
  1. Causing strong moral disgust or loathing
    "His detestable behaviour at the party offended everyone";
    - abhorrent, obscene, repugnant, repulsive, absonant [archaic]
     
  2. Unequivocally detestable
    "detestable vices";
    - abominable, execrable, odious

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