Horrendous (adjective)

1. Extremely bad or unpleasant; causing horror.
2. Inspiring horror or disgust; revolting.

Origin:

From late latin horrendus, from latin horrere ("to stand on end, bristle") and -ous. first recorded in english in the 1590s.

Examples:

1. The scene of the accident was horrendous.
2. The crime was a horrendous act of violence.
3. The storm caused horrendous damage to the city.
4. The food was so bad it was almost horrendous.
5. The smell of the garbage was horrendous.