unreadable
adj. 不值一读的；难以辨认的；难以理解的
例句
He looked back at the woman for approval, but her face was unreadable.
他回头看那个女人想要得到赞同，但她面无表情。
《柯林斯英汉双解大词典》
For some this is the greatest novel in the world. For others it is unreadable.
对有些人来说，这是世界上最好的小说。对另一些人来说，这小说枯燥难懂。
This makes test cases unreadable and increases maintenance.
这使得测试用例可读性差，增加了维护难度。
