From the given sentence, identify the highlighted word that is either incorrectly spelled or used in an inappropriate context.

Because she could not endure the intollerable racket of the broken engine, she had no choice but to request the assistance of an emergency repair professional.

The correct option is intollerable.

Let's analyze the highlighted words in the given sentence:

1. emergency - Spelled correctly and used appropriately to describe the urgent nature of the repair.

2. racket - Spelled correctly and used appropriately to mean a loud, disturbing noise.

3. professional - Spelled correctly and used appropriately to refer to a skilled worker.

4. intollerable - This word is incorrectly spelled. The correct spelling is intolerable (with a single 'l'), which means unbearable or incapable of being endured.

Therefore, the highlighted word that is incorrectly spelled is intollerable.