General opposites:
* Inconspicuous: This is a direct opposite, meaning not easily noticed or attracting attention.
* Unremarkable: This means not standing out or being special in any way.
* Obscure: This means hidden or unknown, the opposite of being well-known or noticeable.
* Minor: This emphasizes the lack of importance or significance, opposite to being prominent.
Opposites related to specific meanings of "prominent":
* Recessed: If "prominent" refers to a physical feature sticking out, "recessed" would be the opposite, meaning sunken in.
* Unimportant: If "prominent" refers to something significant, "unimportant" is the opposite.
* Unknown: If "prominent" refers to someone famous or well-known, "unknown" is the opposite.
The best opposite word will depend on the specific meaning of "prominent" in the context.