· an unknown and unexplored region; "they came like angels out the unknown"

Synonym(s): unknown_region, terra_incognita

Hypernym(s): region

· anyone who does not belong in the environment in which they are found

Synonym(s): stranger, alien

Hypernym(s): intruder, interloper, trespasser

· a variable whose values are solutions of an equation

Synonym(s): unknown_quantity

Hypernym(s): variable

· not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"

Antonym(s): known

· being or having an unknown or unnamed source; "a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor"

Synonym(s): nameless, unidentified, unnamed

· not known to exist; "things obscurely felt surged up from unknown depths"

· not famous or acclaimed; "an obscure family"; "unsung heroes of the war"

Synonym(s): obscure, unsung

· not known before; "used many strange words"; "saw many strange faces in the crowd"; "don't let anyone unknown into the house"

Synonym(s): strange