also: しせい
noun, na-adjective, noun which may take the genitive case particle 'no'
Literary word evoking a powerful, flame-like energy or flourishing state. Rare in everyday speech; mostly found in formal writing or classical contexts.
その詩には青春の熾盛な情熱が溢れている。
That poem overflows with the vigorous passion of youth.
熾盛を極める勢いで事業を拡大した。
They expanded the business with an intensity that reached its peak.
Compound of 熾 (intense fire) and 盛 (flourishing). The exact historical derivation is uncertain; the word is used in classical and literary Japanese to describe a state of blazing vigor.