这个地区的天气相当难以预测。

The weather in this region is quite ___unpredictable.

她的工作安排非常不可预测，经常需要临时变更。

Her work schedule is highly ___unpredictable, often requiring last-minute changes.

在山区旅行可能因为天气条件不可预测而变得危险。

Traveling in the mountains can be dangerous due to ___unpredictable weather conditions.