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The extra power stations are idle when demand is lower.
Valuable machinery is left to lie idle for long periods.
Go upstairs and wake up that idle brother of yours.
You’re just bone idle, all 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).
This is the American English definition of idle. View British English definition of idle.