2 sentences

1. 他的用心险恶，企图挑拨我们的关系。

   tā de yòng​xīn xiǎn'è, qǐ​tú tiǎo​bō wǒ​men de guān​xi.

   His intentions are sinister, as he is attempting to drive a wedge between us.

   Source: Dong Chinese Dictionary

2. 这里的地势异常险恶，行车需格外小心。

   zhè​lǐ de dì​shì yì​cháng xiǎn'è, xíng​chē xū gé​wài xiǎo​xīn.

   The terrain here is exceptionally treacherous; driving requires extra caution.

   Source: Dong Chinese Dictionary