dateless

American  

[deyt-lis] / ˈdeɪt lɪs /

adjective

1. without a date; undated.

2. endless; limitless.

3. so old as to be undatable.

   a dateless rock formation.

4. of permanent interest regardless of age.

   a dateless work of art.

5. having no social engagement.

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dateless British  

/ ˈdeɪtlɪs /

adjective

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

2. having no date or limit

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Etymology

Origin of dateless

First recorded in 1585–95; date ¹ + -less