Loathsome (adjective)

1. Inspiring disgust or hatred; repulsive; offensive; abominable; detestable.
2. Arousing intense aversion or disgust.

Origin:

From middle english, from old english lāðsum, from lāð loath + -sum.

Examples:

1. The conditions in the prison were loathsome.
2. The smell of rotting food was loathsome.
3. The thought of eating that food was loathsome to him.
4. The loathsome disease spread rapidly through the population.
5. The loathsome behavior of the politician led to his resignation.