ˈdātlə̇s adjective
1.
a. : having no fixed term : endless
the dateless rise and fall of the tides
b. : bearing no date
a dateless letter
c. : of an age or duration so great as to preclude the possibility of being assigned a date : immemorial
dateless customs
a spiritual rule of dateless antiquity derived from Rome — G.M.Trevelyan
d. : of continuously living interest : not subject to the adverse effects of the passage of time : timeless
few characters are more dateless than Hamlet
e. : being without a social partner
some of the boys had come to the party dateless
2. dialect England : having mental faculties impaired by old age : foolish
a poor dateless old man