Another word for mean and nasty first letter you?

You're looking for a word that means "mean and nasty" and starts with the letter "Y"?

The best fit for that description would be "Yucky."

While it doesn't quite capture the full intensity of "mean and nasty," it does convey a sense of unpleasantness and repulsiveness, which can be associated with someone's behavior.

Let me know if you'd like other options or have a different word in mind!