Definitions

1. adjective

more fierce or intense; more vigorous and strong-willed

“The fiercer competitor dominated the competition.”

2. comparative form of ‘fierce’

more fierce or intense, especially in comparison to something else

“The attack became fiercer as the enemy approached.”

3. noun

one that is fiercer; a more intense or vigorous person or thing

“The fiercer of the two animals was the one that attacked first.”