idle/ˈaɪd(ə)l/
adj.1. 停顿的；不工作的；不做事的；空闲的Men are left idle when machines break down.机器坏了时，工人们便无事可做了。
2. 懒惰的That boy is really idle.那男孩真懒。
3. 无用的；无价值的Don't listen to idle tales.别听无用的闲话。
It would be idle to argue further.再辩论下去也不会有什么效果。
4. 无因的；无由的idle fears无端的恐惧
His words were just idle threats; You don't have to take them too seriously.他的话只不过是吓人的空话，你不必太认真了。