* Describing a person: The lion tamer faced the fierce lion with unwavering courage.
* Describing an animal: The fierce storm raged all night, tossing the small boat about.
* Describing a competition: The two teams battled fiercely for the championship title.
* Describing an emotion: She felt a fierce determination to succeed in her career.
* Describing an object: The fierce sun beat down on the parched land.
You can also use "fierce" to describe something as intense, strong, or powerful.