In each of the following questions, a sentence with four highlighted words is provided. These highlighted words may be either misspelled or used inappropriately. Select the incorrect word as the answer, and if all the highlighted words are correct in spelling and usage, choose ‘ All are correct’ as answer .

Because we did nothing but sit in the hotel room, our vaccation was vapid and uninteresting.

The correct answer is vaccation.

Let's analyze the highlighted words in the given sentence to identify any spelling or contextual errors:

1. hotel: This word is spelled correctly and appropriately used in the context of staying in a room.
2. vaccation: This word is misspelled. The correct spelling is vacation (with a single 'c').
3. vapid: This word is spelled correctly and means dull, uninteresting, or lacking flavor/spirit. It fits well in the sentence.
4. uninteresting: This word is spelled correctly and properly describes a dull experience.

Therefore, the word vaccation is misspelled, making it the incorrect word among the choices.