Bold, brave, and fierce; showing valor and strong courage (somewhat literary/formal).
彼は戦場で勇猛に戦った。
He fought bravely on the battlefield.
勇猛さだけでは指揮官には向かないこともある。
Bravery alone sometimes doesn't make a good commander.
その武将は勇猛果敢で名を馳せた。
That general became renowned for his valor and daring.