有头无尾 Unfinished
Explanation
比喻事情有开头没结尾，做事情不彻底。
It means something has a beginning but no end, indicating incompleteness or lack of thoroughness in doing things.
Origin Story
话说，张三是个做事有始无终的人。他兴致勃勃地开始学画画，买了各种颜料和画笔，还报了一个绘画班。起初，他非常认真，每天坚持练习，画技突飞猛进。可是没过多久，他的热情就渐渐消退了，练习也越来越少，最后干脆把画笔扔在一边，绘画班也不去了。他的绘画作品就这样虎头蛇尾地搁浅了，有头无尾，令人惋惜。不仅如此，他还尝试过学习吉他、写作、编程，每一次都开始得轰轰烈烈，到头来都不了了之，有头无尾，半途而废，让人不禁感叹他的毅力实在不足。张三的经历也告诉我们，做任何事，都要坚持到底，持之以恒，才能取得成功。否则，即便一开始很优秀，有头无尾的结局，也只会让曾经的努力付诸东流。
Once upon a time, there was a man named Zhang San who was known for starting things but never finishing them. He enthusiastically began learning to paint, buying various paints and brushes, and even enrolling in a painting class. Initially, he was very dedicated, practicing every day, and his painting skills improved rapidly. However, after a while, his passion gradually faded, his practice became less frequent, and finally, he simply abandoned his painting supplies and stopped attending the class. His painting remained unfinished, a great pity. Furthermore, he tried learning the guitar, writing, and programming; each time starting with great enthusiasm, only to leave things unfinished. His experiences taught a valuable lesson: that perseverance and consistency are key to success in any endeavor. Otherwise, even a brilliant start will lead to a wasted effort if left incomplete.
Usage
形容事情有头无尾，做事情不彻底。
To describe something that has been started but not finished.
Examples
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他做事总是虎头蛇尾，有头无尾，让人很不放心。
ta zuòshì zǒngshì hǔtóu shéwěi, yǒu tóu wú wěi, ràng rén hěn bù fàngxīn.
He always does things in a half-hearted way, beginning them but never finishing them, which makes people very uneasy.
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这个计划有头无尾，缺乏周全的考虑。
zhège jìhuà yǒu tóu wú wěi, quēfá zhōuquán de kǎolǜ。
This plan is incomplete and lacks careful consideration.