ex-directory
adjective UK uk/ˌeks.dɪˈrek.tər.i/ us/ˌeks.dɪˈrek.tɔːr.i/ (US unlisted)
（电话号码）不在电话簿上的
used to refer to a phone number that is not made public by the phone company
We've gone ex-directory because we were receiving so many unwanted calls. 我们已经把我们的号码从电话号码簿中取消了，因为老是接到打错的电话。