1) Chronologically ambiguous 2) Dateless 3) Like filler news dispatches 4) Like nonvintage wine 5) Like some artwork or letters 6) Like some letters 7) Like some mail 8) Like some paintings 9) Not bearing a date 10) Not listing year of creation 11) Undatable 1) Stag 2) Undatable 
• (a.) Not dated; having no date; of unknown age; as, an undated letter. • (a.) Rising and falling in waves toward the margin, as a leaf; waved.
adjective not bearing a date; `a dateless letter`