Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having no date whatsoever.
  • adj. So ancient that no date can be determined.
  • adj. Having no limits in time; timeless.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Out of one's head; deranged.
  • adj. thick-headed
  • adj. Without a date imprinted, assigned, or associated.
  • adj. Having no date—a meeting with a lover or potential lover.
  • adj. Timeless; immortal
  • adj. Without a start; immemorial
  • adj. Without an end; endless

from the GNU version of the Collaborative International Dictionary of English

  • adj. Without date; having no fixed time.
  • adj. not having a social companion for an occasion.

from The Century Dictionary and Cyclopedia

  • Having no date; bearing nothing to indicate its date.
  • Not distinguishable or divisible by dates; without incident; eventless.
  • So old or far distant in time as to be undatable; of indefinitely long duration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of such great duration as to preclude the possibility of being assigned a date
  • adj. not bearing a date
  • adj. unaffected by time
  • adj. having no known beginning and presumably no end

Etymologies

Unknown. Perhaps derived from Old English þeatless ("thoughtless', "without plan"). See also deedless. (Wiktionary)
Coined between 1585 and 1595 from date +‎ -less[2] (Wiktionary)

Examples

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