RhymeZone: dateless definitions

Definitions of dateless:

adjective: unaffected by time
Example: "Few characters are so dateless as Hamlet"
adjective: not bearing a date
Example: "A dateless letter"
adjective: of such great duration as to preclude the possibility of being assigned a date
Example: "Dateless customs"
adjective: having no known beginning and presumably no end
Example: "The dateless rise and fall of the tides"