险峻

例句：

1. 1. The mountain was so steep that it was difficult to climb.
   那座山太陡了，难以攀登。
2. 2. The road was too dangerous to drive on during the rainstorm.
   雨中开车太危险了。
3. 3. The cliff face is so abrupt that it looks like it could fall at any moment.
   悬崖面如此陡峭，看起来随时都可能崩塌。