気焔きえん

This word is rare and literary, used in written Japanese to describe fiery passion or boastful, grand talk.

彼の気焔は周囲を圧倒した。
Kare no kien wa shūi o attō shita.
His high spirits overwhelmed those around him.

気焔を吐いても、結果は伴わなかった。
Kien o haite mo, kekka wa tomonawanakatta.
He made boastful talk, but the results didn't follow.

⚖️ Commonly confused with '気炎' (kien), but '気焔' is the standard form for this meaning.