棘手 | jí shǒu | thorny (problem) / intractable | |
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 |