无所用心 without application of heart
Explanation
指不认真思考，不关心任何事情。
Refers to someone who does not think carefully and does not care about anything.
Origin Story
春秋时期，齐国大夫晏婴曾对齐景公说："一个人如果饱食终日，无所用心，那他就像煮熟了的米饭，味道寡淡，毫无生气，即使外表光鲜，实际上也是一无是处。"晏婴还举了几个例子，说明无所用心会使人失去进取心，最终一事无成。他告诫齐景公，要勤于思考，积极进取，才能有所成就。
During the Spring and Autumn Period, Yan Ying, an official of the State of Qi, once said to Duke Jing of Qi: "If a person only eats and does nothing all day, he is like cooked rice, bland and lifeless, even if he looks bright on the outside, he is actually worthless." Yan Ying also gave several examples to illustrate that lack of ambition leads to a loss of ambition and ultimately leads to nothing. He warned Duke Jing of Qi that only by diligent thinking and proactive efforts can one achieve something.
Usage
形容人思想麻木，不思进取。
Describes someone whose thinking is numb and has no ambition.
Examples
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他整天无所用心，浑浑噩噩地过日子。
ta zhengtian wusuoyongxin,hunhunae de guorizi.
He spends his days aimlessly and without any ambition.
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年轻人应该有所作为，而不是无所用心。
nianqingren yinggai yousuozuowei,erbushi wusuoyongxin
Young people should achieve something instead of drifting and doing nothing..