Explanation:

- Astute: This word is spelled correctly. It means having the ability to accurately assess situations or people, showing keen insight.

- Absolute: This is also spelled correctly. It indicates something that is total, complete, or not diminished in any way.

- Abrupt: This word is spelled correctly. It refers to something that is sudden or unexpected.

- Abendance: This word is spelled incorrectly. The correct spelling should be "Abundance," which means a large quantity of something.