knotty

例句：

1. 1.The rope was knotty and hard to untie.
   这根绳子结得非常紧，很难解开。
2. 2. The garden was knotty with weeds.
   花园里到处都是杂草，很凌乱。
3. 3. The knotty problem of the project is still unresolved.
   项目这个棘手的问题还没有解决。