| 棘手 | jí shǒu | thorny (problem) / intractable | ![]() |
| 拗 | ào | (bound form) intractable / contrary / disobedient | ![]() |
| 疑难问题 | yí nán wèn tí | knotty problem / intractable difficulty | ![]() |
| 死结 | sǐ jié | tight knot / intractable problem | ![]() |
| 啎 | wǔ | obstinate, disobedient, intractable | ![]() |
| 死结难解 | sǐ jié nán jiě | enigmatic knot hard to untie (idiom) / thorny problem / intractable difficulty | ![]() |
