If you say that something is ~, you mean that it cannot be achieved or is not available.
There are those who argue that true independent advice is ~.
...an ~ dream.
ADJ
If you say that something is ~, you mean that it cannot be achieved or is not available.
There are those who argue that true independent advice is ~.
...an ~ dream.
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012