What is an antonym for lavatory?

There isn't a direct antonym for "lavatory" in the sense of a bathroom or toilet. However, depending on the context, some words that could be considered opposite in meaning include:

* Outdoor: If you're contrasting a lavatory with an outdoor space for relieving oneself.

* Open air: Similar to "outdoor," emphasizing the lack of enclosure.

* Formal: If "lavatory" is used to refer to a more formal, public bathroom, "informal" could be considered the opposite.

* Clean: If "lavatory" implies a place for hygiene, "dirty" or "unclean" could be considered opposites, though these are more negative connotations.

It's important to consider the context and the specific meaning of "lavatory" when choosing an opposite word.