having no known beginning and presumably no end; the dateless rise and fall of the tides; time is endless; sempiternal truth

[ Syn: endless , sempiternal ]

of such great duration as to preclude the possibility of being assigned a date; dateless customs'

not bearing a date; a dateless letter

[ Syn: undated ]

unaffected by time; few characters are so dateless as Hamlet; Helens timeless beauty

[ Syn: timeless ]