Part of speech: adjective

Not known, or not capable of being known.

Part of speech: noun

An unknown person or quantity.

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Usage examples "unknown":

  1. 326; cause of it unknown, ii. - "Rousseau Volumes I. and II.", John Morley.
  2. That is indeed true; but I find no hint of who this unknown woman was. - "A Life of St. John for the Young", George Ludington Weed.
  3. " But," he answered earnestly, " unknown to myself her vision must always have been here." - "Dross", Henry Seton Merriman.