everlasting; immortal; eternal
A yojijukugo meaning something that will never perish or change through the ages. Often used in literary or formal contexts to describe enduring works, principles, or fame.
His achievements will be passed down as something everlasting.
この名作は千古不滅の輝きを放っている。
This masterpiece shines with an eternal brilliance.
永遠 is a common word for 'eternity' or 'forever', used in everyday and formal contexts. 千古不滅 is a more literary, four-character idiom emphasizing imperishability across millennia.
不朽 means 'immortal' or 'undying', often used for works of art or achievements. 千古不滅 adds the nuance of lasting through thousands of years.
A yojijukugo composed of 千古 (a thousand ages, eternity) and 不滅 (imperishable, indestructible). The exact origin is uncertain, but it follows classical Chinese patterns of four-character idioms.