hideous

Synonyms: abominable animal appalling awful beast bestial detestable disgusting dreadful frightful ghastly grim grisly gross gruesome hateful horrendous horrid loathsome macabre monstrous morbid nasty odious offensive repellent repugnant repulsive revolting shocking sick sickening terrible terrifying ugly uncomely unsightly weird

Antonyms: attractive beautiful charming delightful pleasing