Someone who is ~ works hard or does things very thoroughly.
Podulski had been ~ in learning his adopted language.
= diligent
ADJ
Someone who is ~ works hard or does things very thoroughly.
Podulski had been ~ in learning his adopted language.
= diligent
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012