simple past tense and past participle of unlist
"After the number was removed from the directory, I had to ask every guest at my party to find me on social media since my phone became completely unlisted."
Not included in a list.
"The unlisted guests were invited to sit at the back while the main party celebrated on the dance floor."
Not listed in the telephone directory.
"My neighbor gave me her unlisted number so she could answer calls without strangers finding out where she lives."