凶狠 (xiōng hěn): tàn nhẫn

That stray dog had a fierce look in its eyes, scaring the child into hiding behind his mother.

The robber violently pushed the clerk aside and grabbed the cash from the register.

He is usually gentle, but during debates his tone turns aggressive, as if he has become a different person.

The news reported that the vicious fugitive was finally captured by the police.

The boss harshly criticized the subordinate who made a mistake, and the atmosphere in the office instantly became tense.