This is the 6610th most frequent Russian word.
idle
The Russian word "idle" does not exist; it is an English word meaning "inactive" or "not working." In Russian, a similar concept is expressed with words like "бездействующий" or "праздный."
The word 'idle' ('праздность') here is used as a noun to express a state of inactivity.
Он провел весь день в праздности, вместо того чтобы выполнить работу.
He spent the entire day idle, instead of completing his tasks.
The word 'idle' ('на холостом ходу') in this sentence conveys a state where a machine is active but not performing any meaningful work.
Этот двигатель работает на холостом ходу, ожидая следующей команды.
This engine runs idle, waiting for the next command.
The word 'idle' ('праздным') is employed here as an adjective to describe a state of being inactive or unoccupied, a behavior being addressed to the subject.