without a date; undated.
endless; limitless.
so old as to be undatable: a dateless rock formation.
of permanent interest regardless of age: a dateless work of art.
having no social engagement.

1585–95; date1 + -less Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
date1 (deɪt)
1.  a specified day of the month: today's date is October 27
2.  the particular day or year of an event: the date of the Norman Conquest was 1066
3.  (plural) the years of a person's birth and death or of the beginning and end of an event or period
4.  an inscription on a coin, letter, etc, stating when it was made or written
5.  a.  an appointment for a particular time, esp with a person to whom one is sexually or romantically attached: she has a dinner date
 b.  the person with whom the appointment is made
6.  the present moment; now (esp in the phrases to date, up to date)
7.  (tr) to mark (a letter, coin, etc) with the day, month, or year
8.  (tr) to assign a date of occurrence or creation to
9.  (intr; foll by from or back to) to have originated (at a specified time): his decline dates from last summer
10.  (tr) to reveal the age of: that dress dates her
11.  to make or become old-fashioned: some good films hardly date at all
12.  informal chiefly (US), (Canadian)
 a.  to be a boyfriend or girlfriend of (someone of the opposite sex)
 b.  to accompany (a member of the opposite sex) on a date
[C14: from Old French, from Latin dare to give, as in the phrase epistula data Romae letter handed over at Rome]

dateless (ˈdeɪtlɪs)
1.  likely to remain fashionable, relevant, or interesting regardless of age; timeless
2.  having no date or limit

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
They are dateless in a sense and, because they are carefully crafted, are long-lasting.
When they have chosen, the dateless guy comes back in and must guess who they are with the dating game questions he asks.
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