3 sentences for 凶 (xiōng — vicious)

1. 他满脸横肉，看起来很凶。

   tā mǎn​liǎn héng​ròu, kàn​qǐ​lai hěn xiōng.

   He has a fierce, fleshy face and looks very mean.

   Source: Dong Chinese Dictionary

2. 别看他长得很凶，其实他的性格很随和。

   bié kàn tā zhǎng de hěn xiōng, qí​shí tā de xìng​gé hěn suí​hé.

   Don't be fooled by his fierce appearance; he actually has a very easygoing personality.

   Source: Dong Chinese Dictionary

3. 此人性格凶暴，动不动就对他人拳脚相向。

   cǐ rén xìng​gé xiōng bào, dòng​bu​dòng jiù duì tā​rén quán​jiǎo​xiāng​xiàng.

   This person has a violent nature and often attacks others physically.

   Source: Dong Chinese Dictionary