resolute; determined; bold
敵陣へ果敢に攻め込んだ。
They launched a bold assault on the enemy lines.
果敢に挑戦する姿勢が彼を成長させた。
His attitude of taking on challenges boldly helped him grow.
彼女は周囲の反対を押し切って果敢に起業した。
She boldly started her own business despite opposition from those around her.