In terms of physical space:
* Shallowness: This is the most direct opposite, referring to a lack of depth in something like a body of water or a pit.
* Surface: This refers to the top layer of something, as opposed to its interior.
In terms of meaning or understanding:
* Superficiality: This refers to a lack of depth in understanding, thought, or feeling.
* Simplicity: This refers to a lack of complexity or intricacy.
* Triviality: This refers to something lacking in importance or significance.
In terms of experience:
* Surface-level: This refers to an experience that is limited to the surface and lacks depth or engagement.
* Shallowness: This can also refer to a lack of depth in emotional experience.
To determine the most accurate opposite of "depth," consider the context in which you're using the word.