undated
adj.adj. describing something that does not have a date written on it. You use this for things like old letters, photos, or documents where you don't know exactly when they were made.
adj. lacking a recorded date of origin, execution, or expiration. Often used in archival or legal contexts to describe documents or correspondence that fail to specify a day, month, or year.
The police found an undated letter in the desk drawer.
Historians struggled to organize the collection because many of the personal journals were undated and unsigned.
The museum's acquisition of the undated manuscript sparked a debate among scholars regarding whether the linguistic style placed it in the early or late seventeenth century.
From un- + dated.
From Latin undatus, past participle of undare (“to rise in waves, to wave, to undulate”).
Typically used as an attributive adjective before a noun like 'letter', 'document', or 'check'.