1. Not known (synset 301379820)
    "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
  2. Being or having an unknown or unnamed source (synset 300121594)
    "a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor"
  3. Not known to exist (synset 302379193)
    "things obscurely felt surged up from unknown depths"
  4. Not famous or acclaimed (synset 301126357)
    "an obscure family"; "unsung heroes of the war"
  5. Not known before (synset 300969942)
    "used many strange words"; "saw many strange faces in the crowd"; "don't let anyone unknown into the house"
  1. An unknown and unexplored region (synset 108649671)
    "they came like angels out the unknown"
  2. Anyone who does not belong in the environment in which they are found (synset 110680441)
  3. A variable whose values are solutions of an equation (synset 107286353)

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