What is the antonym of idle?

The antonym of idle depends on the context, but some common options include:

General Antonyms:

* Busy

* Active

* Productive

* Engaged

* Occupied

* Working

* Diligent

Antonyms related to specific meanings of "idle":

* Operating: (if referring to a machine)

* Working: (if referring to a person)

* Moving: (if referring to a physical object)

* Relevant: (if referring to an idea or statement)

* Meaningful: (if referring to a task or activity)

The best antonym to use will depend on the specific meaning of "idle" in the context you are using it.