1. Previously unknown; unprecedented.
    • 1912 January, Zane Grey, chapter 9, in Riders of the Purple Sage: A Novel, New York, N.Y.; London: Harper & Brothers Publishers, OCLC 6868219 ↗:
      Starvation in the uplands was not an unheard-of thing […]
    • 2004, Peter Bondanella, Hollywood Italians: Dagos, Palookas, Romeos, Wise Guys, and Sopranos, chapter 4, gbooks :
      Prohibition produced the immense and previously unheard-of wealth that launched truly organized crime in America.
  2. Unknown or known to only few people.

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