precarious

Definition

Not securely held or in position; dangerously likely to fall or collapse. Also refers to a situation that is uncertain or risky.

中文 未能牢固地保持或处于不稳定位置；危险地可能跌落或崩溃，也指情况不确定或有风险。

Example

"The hiker made her way across the precarious rope bridge high above the canyon."