taru-adjective, adverb taking the 'to' particle
with heroic drive and boundless energy
Describes a person or action full of brave spirit and vigorous momentum. Often used in literary or formal contexts.
彼は雄気堂々と戦場に臨んだ。
He faced the battlefield with heroic drive and boundless energy.
その演説は雄気堂々たるもので、聴衆を魅了した。
The speech was full of heroic spirit and captivated the audience.
A yojijukugo combining 雄気 (heroic spirit) and 堂々 (imposing, magnificent). The exact historical derivation is uncertain, but the phrase is conventionally associated with a bold and energetic demeanor.