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The Collaborative International Dictionary of English v.0.48 (gcide)

Idle \I"dle\, a. [Compar. {Idler}; superl. {Idlest}.] [OE. idel,
AS. [imac]del vain, empty, useless; akin to OS. [imac]dal, D.
ijdel, OHG. [imac]tal vain, empty, mere, G. eitel, Dan. & Sw.
idel mere, pure, and prob. to Gr. ? clear, pure, ? to burn.
Cf. {Ether}.]
1. Of no account; useless; vain; trifling; unprofitable;
thoughtless; silly; barren. "Deserts idle." --Shak.
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Every idle word that men shall speak, they shall
give account thereof in the day of judgment. --Matt.
xii. 36.
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Down their idle weapons dropped. --Milton.
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This idle story became important. --Macaulay.
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2. Not called into active service; not turned to appropriate
use; unemployed; as, idle hours.
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The idle spear and shield were high uphing.
--Milton.
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3. Not employed; unoccupied with business; inactive; doing
nothing; as, idle workmen.
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Why stand ye here all the day idle? --Matt. xx. 6.
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4. Given rest and ease; averse to labor or employment; lazy;
slothful; as, an idle fellow.
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5. Light-headed; foolish. [Obs.] --Ford.
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{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.

Syn: Unoccupied; unemployed; vacant; inactive; indolent;
sluggish; slothful; useless; ineffectual; futile;
frivolous; vain; trifling; unprofitable; unimportant.

Usage: {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.
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Idler \I"dler\, n.
1. One who idles; one who spends his time in inaction; a lazy
person; a sluggard.
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2. (Naut.) One who has constant day duties on board ship, and
keeps no regular watch. --Totten.
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3. (Mach.) An idle wheel or pulley. See under {Idle}. Idless