If you describe something as ~, you mean that it is not at all useful.
Such attitudes are ~ unless they reflect inner cognition and certainty.
...commercially ~ trees.
= worthless
ADJ
If you describe something as ~, you mean that it is not at all useful.
Such attitudes are ~ unless they reflect inner cognition and certainty.
...commercially ~ trees.
= worthless
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012