If you describe someone as ~, you mean that they are calm and do not seem to be affected by surprising or frightening events.
= unperturbed
ADJ
If you describe someone as ~, you mean that they are calm and do not seem to be affected by surprising or frightening events.
= unperturbed
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012