UNDATED Meaning of UNDATED in English un ‧ dat ‧ ed /ʌnˈdeɪtəd, ʌnˈdeɪtɪd/ BrE AmE adjective a letter, article, painting etc that is undated does not have a date written on it Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012