那座老房子的结构很不稳固，让人担心它的安全性。

The ___precariousness of the old house's structure made us worry about its safety.

疫情加剧了临时工的就业不稳定性。

The pandemic has increased the ___precariousness of temporary workers' employment.

岩石的松动增加了攀爬的危险性。

The ___precariousness of the loose rocks made the climb dangerous.