Explanation:

- Option 1: Longitude

- Correct spelling used here. "Longitude" refers to the geographic coordinate that specifies the east-west position of a point on the Earth's surface.

- Option 2: Contrary

- Correctly spelled word. "Contrary" means opposite in nature, direction, or meaning.

- Option 3: Manners

- This is spelled correctly. "Manners" refer to the way in which a person behaves towards others.

- Option 4: Terribal

- Incorrectly spelled word. The correct spelling is "Terrible," which means extremely bad or horrifying.

Option 4: Terribal is the incorrectly spelled word.