unlisted
adj. B2 Upper Intermediate US //ənˈɫɪstɪd// UK //ʌnlˈɪstɪd// un·list·ed
adj. not included in a list or a public record. You use this to describe something that is hidden or not easy to find.
adj. not included in a list, directory, or public record. Often used to describe phone numbers or property listings that are intentionally kept private.
The phone number is unlisted so people cannot find it.
The real estate agent mentioned that the house is unlisted and only available to pre-approved buyers.
While the majority of the collection is digitized, several rare manuscripts remain unlisted in the public catalog to protect them from potential theft or damage.