idle

Empty, vacant.

Not being used appropriately; not occupied; (of time) with no, no important, or not much activity.

idle hours

My computer hibernates after it has been idle for 30 minutes.

Not engaged in any occupation or employment; unemployed; inactive; doing nothing in particular.

idle workmen

Molly the dairymaid came a little way from the rickyard, and said she would pluck the pigeon that very night after work. She was always ready to do anything for us boys; and we could never quite make out why they scolded her so for an idle hussy indoors. It seemed so unjust. Looking back, I recollect she had very beautiful brown eyes.

Averse to work, labor or employment; lazy; slothful.

an idle fellow

“I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the insolent chatterers at the opera, the gorged dowagers, the worn-out, passionless men, the enervated matrons of the summer capital,[…]!”

Of no importance; useless; worthless; vain; trifling; thoughtless; silly.

an idle story;  idle talk;  idle rumor

To spend in idleness; to waste; to consume.

To lose or spend time doing nothing, or without being employed in business.

to idle in an IRC channel

He had already heard of the young man's projected journey — evidently the Comte de Combourg had written many letters while his son idled at St. Malo […]

Of an engine: to run at a slow speed, or out of gear; to tick over.

High levels of all pollutants were found during time idling in stations.

To cause (an engine) to idle(3)

The driver idled his engine until the car finally stalled.

The state of idling, of being idle.

The lowest selectable thrust or power setting of an engine.

a lumpy idle

A slight valve tap was audible at idle but was not noticeable otherwise.

An idle animation.

An idle game.