unlisted

adjective

1. not listed; not entered in a list or directory: an unlisted telephone number.
2. (of a security) not admitted to trading privileges on an exchange.

adjective

1. not entered on a list
2. US and Canadian (of a telephone number or telephone subscriber) not listed in a telephone directoryBrit term: ex-directory

adj.1640s, from un- (1) “not” + past participle of list (v.). In reference to stocks, attested from 1905; of phone numbers, from 1937 (American English).