unknown
unknown - noun
an unknown and unexplored region
anyone who does not belong in the environment in which they are found
a variable whose values are solutions of an equation
unknown - adjective
- not known
- being or having an unknown or unnamed source
- not known to exist
- not famous or acclaimed
- not known before
unknown - thesaurus
alien
nameless
obscure
strange
stranger
unidentified
unnamed
unsung