Select the INCORRECTLY spelt word.

gregerious

The incorrectly spelled word is "gregerious" (Option 4).

Explanation:

1. Multifarious: This word is correctly spelled. It means having many different parts or elements, diverse, or varied.

2. Miscellaneous: This word is correctly spelled. It refers to a collection or mixture of diverse or unrelated things.

3. Hilarious: This word is correctly spelled. It describes something that is extremely funny or amusing.

4. Gregerious: This is the misspelled form of the word "gregarious," which means fond of the company of others, sociable, or outgoing. The correct spelling is "gregarious," with only one "e" in the middle.