What is an synonym for the word idle?

Here are some synonyms for "idle," depending on the context:

General inactivity:

* Inactive

* Inert

* Still

* Unoccupied

* Resting

* Unproductive

* Unemployed

* At leisure

For a machine:

* Not in use

* Out of commission

* Down

* Non-operational

For a person:

* Lazy

* Indolent

* Slothful

* Unoccupied

* Unproductive

* Unemployed

For a thought or idea:

* Futile

* Useless

* Meaningless

* Unproductive

* Trivial

The best synonym to use will depend on the specific context of the sentence.