IPA: /ˈdeɪtləs/
KK: /ˈdeɪtləs/
Not having a specific date or time associated with it; timeless or ancient.
The dateless ruins of the ancient city stood silently in the desert.
Dateless → It is formed from "date" (from Old French *date*, meaning a fixed point in time) and "-less" (meaning without). The word "dateless" means without a specific date or time.
Think of being 'without' ('-less') a 'fixed point in time' ('date') — that's what dateless means.