2 sentences for 險 (xiǎn — rugged)

1. 这条通往山后的路异常崎险。

   zhè tiáo tōng​wǎng shān hòu de lù yì​cháng qí xiǎn.

   This path leading to the back of the mountain is exceptionally rugged and treacherous.

   Source: Dong Chinese Dictionary

2. 前面的山路非常险，你要多加小心。

   qián​miàn de shān​lù fēi​cháng xiǎn, nǐ yào duō​jiā xiǎo​xīn.

   The mountain road ahead is very dangerous; you should be extra careful.

   Source: Dong Chinese Dictionary