凶 (xiōng): khủng khiếp

The weather forecast says a fierce typhoon will make landfall tomorrow, so everyone had better prepare in advance.

That dog suddenly became very fierce, barking wildly at passersby, scaring the child into hiding behind his mother.

He glared at me fiercely, as if I had done something to wrong him.

Lately he looks very fierce and loses his temper at the slightest provocation, so everyone tries to avoid talking to him.

This car accident was very dangerous; fortunately, the driver braked in time, so there were no casualties.