precarious

他在悬崖边的那个位置看起来很危险。

His position on the edge of the cliff looks ___precarious.

那堆箱子看起来很不稳固，轻微摇晃着。

The stack of boxes looked ___precarious as it wobbled slightly.

由于市场波动，他的生意现在处于不稳定的状态。

His business is in a ___precarious position due to market fluctuations.