プログレッシブ和英中辞典(第4版)の解説
あくなき【飽く無き】
〔満足することのない〕insatiable；〔粘り強い〕persistent
飽くなき野望
insatiable ambition
取り調べ官の飽くなき追及についに容疑者は口を割った
As a result of a police officer's persistent questioning, the suspect finally broke down and talked.
成功への飽くなき努力が今日の彼を作った
His unceasing efforts to achieve success have made him what he is today.