What is a synonym for awful?

Here are some synonyms for "awful," depending on the context and desired intensity:

General negativity:

* Terrible

* Dreadful

* Horrible

* Appalling

* Atrocious

* Disgusting

* Shocking

* Frightful

More intense negativity:

* Abysmal

* Deplorable

* Repulsive

* Gruesome

* Heinous

Informal/slang:

* Lousy

* Crummy

* Yucky

* Gross

Specific contexts:

* For taste: Disgusting, revolting, sickening, vile

* For appearance: Ugly, hideous, grotesque, monstrous

* For behavior: Wicked, evil, depraved, monstrous

* For an experience: Miserable, agonizing, traumatic, excruciating

The best synonym will depend on the specific situation and your intended meaning.