If you say that someone is ~, you mean that they are not available because they are ill, or for a reason that you do not want to reveal. (FORMAL)
The speaker was regrettably ~.
= unwell
ADJ: usu v-link ADJ
If you say that someone is ~, you mean that they are not available because they are ill, or for a reason that you do not want to reveal. (FORMAL)
The speaker was regrettably ~.
= unwell
ADJ: usu v-link ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012