dateless

[ deyt-lis ]

/ ˈdeɪt lɪs /

without a date; undated.

endless; limitless.

so old as to be undatable: a dateless rock formation.

of permanent interest regardless of age: a dateless work of art.

having no social engagement.

Origin of dateless

First recorded in 1585–95; date¹ + -less

He can only do this out of the materials ready to his hand, but that which he builds has the dignity of dateless age.

Modern Painters Volume I (of V) |John Ruskin
Or take Shakespeare's epithet when he speaks of "death's dateless night."

Talks on the study of literature. |Arlo Bates
Mrs. Owen had herself offered confirmation by placing the delivery of the dateless letter five years earlier.

A Hoosier Chronicle |Meredith Nicholson
Its position on the mace and sceptre is, therefore, a symbolic emblem of dateless antiquity.

Edinburgh |Rosaline Masson

Individual personality is perhaps the most dateless of all phenomena.

The Theory of the Theatre |Clayton Hamilton

dateless

/ (ˈdeɪtlɪs) /

likely to remain fashionable, relevant, or interesting regardless of age; timeless

having no date or limit