Definition of "idler" in English

noun

1. One who idles; one who spends their time in inaction.

2. One who idles; a lazy person; a sluggard.

3. (nautical, dated) Any member of a ship's crew who is not required to keep the night-watch.

4. A mechanical device such as a pulley or wheel that does not transmit power through its own axle, but forms part of a gear train, supports a moving belt, etc.

adjective

1. comparative form of idle: more idle