Yes, idle is a Scrabble word!

Verb

1. Run disconnected or idle

2. Be idle; exist in a changeless situation

Adjective

1. Not in action or at work

2. Without a basis in reason or fact

3. Not in active use

4. Silly or trivial

5. Lacking a sense of restraint or responsibility

6. Not yielding a return

7. Not having a job

Noun

1. The state of an engine or other mechanism that is idling