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Etymology edit

From un- +‎ explained.

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Adjective edit

unexplained (not comparable)

  1. Not explained; of unknown cause or origin.
    • 1961 October, “The winter timetables of British Railways: Southern Region”, in Trains Illustrated, page 593:
      Why this already very fast train should be speeded up still further, when none of the other more easily timed S.R. West of England trains has a single minute pared from its schedule, is unexplained - unless this is a playful dig at the Western Region, most of whose expresses, by reason of additional stops, will be decelerated from the same date.

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