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• n  an unknown and unexplored region
  they came like angels out the unknown
• n  anyone who does not belong in the environment in which they are found
• n  a variable whose values are solutions of an equation
• a  not known
  an unknown amount
  an unknown island
  an unknown writer
  an unknown source
• s  being or having an unknown or unnamed source
  a poem by an unknown author
• s  not known to exist
  things obscurely felt surged up from unknown depths
• s  not famous or acclaimed
• s  not known before
  don't let anyone unknown into the house

• Yet such studies insistently conclude that, having controlled for socioeconomics, there must be some unknown biological factor (as opposed to some unknown social or cultural factor .
• Einstein himself, though, would remain in that unknown a while longer.
• Researchers at Germany's University of Cologne asked participants to pick between two carriers--one familiar and one unknown.

• unknown region
• terra incognita
• stranger
• alien
• unknown quantity
• nameless
• unidentified
• unnamed
• obscure
• unsung
• strange

• acquaintance
• known

News & Articles

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• 'XCOM: Enemy Unknown' Review: Tactical Alien Combat Touches Down On iOS
  XCOM: Enemy Unknown was one of the best games of 2012 and it's easily one of the best iOS apps of 2013.
  June 21, 2013 - Forbes
• Unknown Mortal Orchestra's Otis Redding cover: Lunchtime Listen
  Unknown Mortal Orchestra covers Otis Redding, and we'd like a whole record of soul covers, please.
  June 19, 2013 - The Oregonian
• Unknown substance found at Lake Hamilton
  Authorities have been dealing with an unknown substance in Lake Hamilton since 10:30 Wednesday morning.
  June 19, 2013 - KTHV Little Rock

Quotes

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• Ayub Khan in France24
  If you thought we were motivated before tonight to bring the hardware to Cleveland, I can tell you that this shameful display of selfishness and betrayal by one of our very own has shifted our 'motivation' to previously unknown and previously never... Dan Gilbert http://www.google.com/url?q=http://en.wikipedia.org/wiki/Dan_Gilbert_(businessman)&source=dictionary&usg=AFQjCNH-TM6RaWMMgvMRno_6aG8SGI5Jpg Reuters http://www.google.com/url?q=http://www.reuters.com/article/idUSTRE6680PI20100709&source=dictionary&usg=AFQjCNGjlJir-KKJZGYS9A2HrAPKrIZSuw Jul 8, 2010 105122 138513 unknown One was blown up here while the second fled to an unknown location. We believe it may be used to attack some other place," Khan told the Reuters news agency.
• Tony Hayward in ShareCast
  This is a basic summary of the facts as gathered by the investigation team to date. A lot remains unknown, but we hope that the briefings will help the government's inquiries,chief executive Tony Hayward said.