If you describe something that someone does as ~, you mean that it is not sensible or wise.
They would be ~ to do this...
ADJ: oft ADJ to-inf
If you describe something that someone does as ~, you mean that it is not sensible or wise.
They would be ~ to do this...
ADJ: oft ADJ to-inf
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012