不太坚固的

例句：

1. 1. The house was built on a rocky slope and is not very stable.
   这座房子建在岩石斜坡上，不太稳固。
2. 2. The bridge was old and unstable, making it dangerous to cross.
   这座桥很旧且不稳固，过桥非常危险。
3. 3.The ground was unstable due to the heavy rain, causing the trees to fall over.
   由于大雨，地面变得不稳定，导致树木倒塌。