1. • noun - an unknown and unexplored region
   • noun - anyone who does not belong in the environment in which they are found
   • noun - a variable whose values are solutions of an equation
   • adj - not known
   • adj - being or having an unknown or unnamed source
   • adj - not known to exist
   • adj - not famous or acclaimed
   • adj - not known before
2. • Not known; unfamiliar: a modern-day problem unknown in earlier times.
   • Not identified or ascertained: received flowers from an unknown admirer.
   • Not established or verified.
   • Not well known or widely known: an unknown artist.
   • A person or thing that is unknown: “the abyss of the unknown” (Helena Petrovna Blavatsky).
   • A person who is not well known, as to the general public: cast an unknown in the starring role.
   • A quantity of unknown numerical value.
3. • n - one that is not known

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