没头没脑 headlong
Explanation
形容做事或说话没有条理，毫无头绪，没有根据。
Describes something or someone that is disorganized and without any plan or sense of direction.
Origin Story
从前，有个年轻人叫小明，他性格冲动，做事总是没头没脑。一天，他听说山里发现了一处宝藏，便立刻背起包袱，也不做任何准备，就往山里跑去了。他翻山越岭，走了好几天，不仅没找到宝藏，还迷了路，最后不得不向村民求救，狼狈地回了家。这件事让他明白，做事要有计划，不能没头没脑。从此以后，小明做事认真细致，凡事都先做好计划，再付诸行动，最终在事业上取得了很大的成功。
Once upon a time, there was a young man named Xiaoming, who was impulsive and always acted without a plan. One day, he heard that a treasure had been discovered in the mountains, so he immediately packed his bags and ran into the mountains without any preparation. He climbed mountains and crossed valleys for several days, but not only did he not find the treasure, but he also got lost. Finally, he had to ask the villagers for help and returned home in disgrace. This experience taught him that he must have a plan when doing things and not act rashly. From then on, Xiaoming worked carefully and meticulously. He carefully planned everything before he acted and eventually achieved great success in his career.
Usage
常用来形容做事或说话没有条理，毫无头绪，没有根据。
Often used to describe doing things or speaking without any order, clue, or reason.
Examples
-
他做事总是没头没脑的，让人捉摸不透。
tā zuòshì zǒngshì méi tóu méi nǎo de, ràng rén zhuōmō bù tòu。
He always does things without any sense of direction, making it hard to understand him.
-
这场辩论没头没脑，让人一头雾水。
zhè chǎng biànlùn méi tóu méi nǎo, ràng rén yī tóu wù shuǐ。
This debate is disorganized and confusing to everyone involved.