He is conscientious and diligent, and is never idle.

他是个勤谨人，整天闲不住。

《新英汉大辞典》

He is never idle saving sleep.

他除睡觉时外从不闲着。

youdao

Every one should observe time and never idle little away.

人人都应该守时，决不虚度时光。

youdao

Mr Spitzer, never one to be idle, is off to a running start.

ECONOMIST: Governors old and new: The second term-inator | The

Indeed, other research shows that the majority of files downloaded from peer-to-peer networks simply sit idle on hard drives, never to be accessed.

FORBES: LimeWire, BitTorrent and BearShare...Oh My!

Although Mr Powell's upbringing was on upper class lines, he never had the prospect of being one of the idle rich.

ECONOMIST: Anthony Powell