1. (a.) Frightful, shocking, or offensive to the eyes\; dreadful to behold; as, a hideous monster; hideous looks.

2. (a.) Distressing or offensive to the ear; exciting terror or dismay; as, a hideous noise.

3. (a.) Hateful; shocking.

abhorrent abominable appalling astounding atrocious awe-inspiring awesome awful baneful beastly contemptible damnable dire direful disgusting dread dreaded dreadful exceptionable execrable fell forbidding formidable foul frightful ghastly ghoulish grim grisly grotesque gruesome hateful heinous horrendous horrible horrid horrific horrifying ill-favored ill-looking inadmissible loathsome lurid macabre monstrous morbid nasty nauseating nauseous odious offensive outrageous redoubtable repellent repelling repugnant repulsive revolting rotten schrecklich shocking sickening terrible terrific terrifying tragic tremendous ugly unacceptable unbeautiful uncomely undesirable unsightly unspeakable unwanted unwelcome vile