What does "idle" mean?

Additional senses

1. 2.Not called into active service; not turned to appropriate use; unemployed; as, idle hours. The idle spear and shield were high uphing. Milton.
2. 3.Not employed; unoccupied with business; inactive; doing nothing; as, idle workmen. Why stand ye here all the day idle Matt. xx.
3. 4.4. Given rest and ease; averse to labor or employment; lazy; slothful; as, an idle fellow.
4. 5.Light-headed; foolish. [Obs.] Ford. Idle pulley (Mach.), a pulley that rests upon a belt to tighten it; a pulley that only guides a belt and is not used to transmit power. -- Idle wheel (Mach.), a gear wheel placed between two others, to transfer motion from one to the other without changing the direction of revolution. -- In idle, in vain. [Obs.] "God saith, thou shalt not take the name of thy Lord God in idle." Chaucer. -- Idle, Indolent, Lazy. A propensity to inaction is expressed by each of these words; they differ in the cause and degree of this characteristic. Indolent denotes an habitual love to ease, a settled dislike of movement or effort; idle is opposed to busy, and denotes a dislike of continuous exertion. Lazy is a stronger and more contemptuous term than indolent.
5. 6.To lose or spend time in inaction, or without being employed in business. Shak.
6. 7.To spend in idleness; to waste; to consume; -- often followed by away; as, to idle away an hour a day.