Undated
Part of speech: adjective
Definition: not marked with a date of a style that will not go out of fashion; a classic
Dateless
Part of speech: adjective
Definition: Out of one's head; deranged.thick-headedWithout a date imprinted, assigned, or associated.Having no date—a meeting with a lover or potential lover.Timeless; immortalWithout a start; immemorialWithout an end; endless