Undated a. : Rising and falling in waves toward the margin, as a leaf; waved.

Undated a. : Not dated; having no date; of unknown age; as, an undated letter.

Example:
How much is my Undated 20p coin really worth?

Taxonomy
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Defination from the web:
undated from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "undated" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...