with no particular purpose, reason, or foundation
无目的地;无理由地;无根据地
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‘How was the race?’ Kate asked idly .“比赛结果怎么样?”凯特漫无目的地问道。
in an inactive or lazy way
无动于衷地;懒散地
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I can no longer stand idly by and let him take the blame .我再也不能无动于衷地站在一旁,让他受责备了。