Sneaking off is a term that means leaving without being noticed. Some synonyms for sneaking off include slipping away, slinking away, tiptoeing away, absconding, escaping, creeping away, ducking out, and skulking. Other words that can be used to describe the act of sneaking off include disappearing, vanishing, and slipping away quietly. Sneaking off can have a negative connotation, suggesting that the person leaving is doing so without permission or without wanting to be caught. However, it can also be used in a more innocent context, such as slipping away quietly from a party or gathering.