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The extra power stations are idle when demand is lower.
Valuable machinery is left to lie idle for long periods.
Get upstairs and wake up that idle brother of yours.
You're just bone idle, the lot of you.
It was only from idle curiosity that she opened the book.
It didn't sound like an idle threat to me (=it was a real threat).
It would be idle to speculate on what the figures might have been in different circumstances.
This is the British English definition of idle. View American English definition of idle.