[n] a variable whose values are solutions of an equation
[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
[adj] being or having an unknown or unnamed source; "a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor"
[adj] not known before; "used many strange words"; "saw many strange faces in the crowd"; "don't let anyone unknown into the house"
[adj] not famous or acclaimed; "an obscure family"; "unsung heroes of the war"
[adj] not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
[adj] not known to exist; "things obscurely felt surged up from unsuspected depths in her"- Edith Wharton
alien, anonymous, chartless, dishonorable, inglorious, nameless, obscure, strange, stranger, terra incognita, transcendent, unbeknown(p), unbeknownst(p), uncharted, undiagnosed, undiscovered, unexplored, unfamiliar, unheard-of, unidentified, unknowable, u