noun which may take the genitive case particle 'no', noun
furious energy; frenzied activity; ferocious intensity
Describes a person or group acting with the fierce, unstoppable energy of a lion charging forward. Often used with ～の勢い, ～の活躍, or as a の-adjective modifying nouns like 働き, 努力, 攻撃.
He made the project a success through his furious efforts.
選手たちは獅子奮迅の勢いで攻め続けた。
The players kept attacking with ferocious momentum.