一窍不通 completely ignorant
Explanation
这个成语形容一个人对某事完全不懂，一点儿也理解不了。比喻没有一点儿见识或学问。
This idiom describes a person who is completely ignorant of something, and can't understand it at all. It compares someone to someone who has no knowledge or education.
Origin Story
相传在古代，有一个名叫商纣王的昏君。他只知道享乐，沉溺于酒色，对国家大事一窍不通。他宠爱妲己，听信了她的谗言，杀害了许多忠臣。其中有一位名叫比干的忠臣，他多次劝谏商纣王，希望他能改过自新。然而，商纣王固执己见，不听劝告，反而将比干杀了。他命人挖开比干的胸膛，查看比干的心脏，想要看看他的心脏是不是真的不通。这个故事就叫做“一窍不通”。
It is said that in ancient times, there was a tyrannical ruler named Shang Zhou. He only knew how to enjoy himself, and he was addicted to wine and women, and he knew nothing about state affairs. He loved Daji and listened to her lies, killing many loyal ministers. Among them was a loyal minister named Bi Gan, who repeatedly admonished Shang Zhou, hoping that he would mend his ways. However, Shang Zhou remained stubborn and refused to listen to advice, instead killing Bi Gan. He ordered Bi Gan's chest to be cut open, to examine Bi Gan's heart, to see if his heart was really impermeable. This story is called “Yī Qiào Bù Tōng”.
Usage
这个成语通常用来形容一个人对某事完全不懂，可以用来批评那些学习不努力、知识缺乏的人。
This idiom is often used to describe a person who is completely ignorant of something. It can be used to criticize those who do not study hard and lack knowledge.
Examples
-
他就是个一窍不通的笨蛋，什么都学不会。
ta jiu shi ge yi qiao bu tong de ben dan, shen me dou xue bu hui.
He's a complete dunce, he can't learn anything.
-
这个概念太复杂了，我简直是一窍不通。
zhe ge gai nian tai fu za le, wo jian zhi shi yi qiao bu tong
This concept is too complex, I don't understand it at all.