Definition of Idle

Adjective: idle (idler,idlest) I-d(u)l

Not in action or at work
"an idle labourer"; "idle drifters"; "the idle rich"; "an idle mind"
Without a basis in reason or fact
"idle fears";
- baseless, groundless, unfounded, unwarranted, wild
Not in active use
"idle hands"; "the machinery sat idle during the strike";
- unused
Silly or trivial
"idle pleasure"; "light idle chatter";
- light
Lacking a sense of restraint or responsibility
"idle talk";
- loose
Not yielding a return
"idle funds";
- dead
Not having a job
"idle carpenters";
- jobless, out of work

Verb: idle I-d(u)l

Run disconnected or idle
"the engine is idling";
- tick over
Be idle; exist in a changeless situation
"He idled in bed all morning";
- laze, slug, stagnate

Noun: idle I-d(u)l

The state of an engine or other mechanism that is idling
"the car engine was running at idle"