unknown
1. [ adjective ] not known
Examples:

"an unknown amount" "an unknown island" "an unknown writer" "an unknown source"

Related terms: known undiscovered transcendent chartless unbeknown undiagnosed unheard-of unidentified unfamiliar inglorious unacknowledged
2. [ noun ] an unknown and unexplored region
Synonyms: terra_incognita unknown_region
Examples:

"they came like angels out the unknown"

Related terms: region
3. [ adjective ] being or having an unknown or unnamed source
Synonyms: nameless unnamed unidentified
Examples:

"a poem by an unknown author" "corporations responsible to nameless owners" "an unnamed donor"

Related terms: anonymous
4. [ adjective ] not known to exist
Examples:

"things obscurely felt surged up from unsuspected depths in her"- Edith Wharton

Related terms: unsuspected
5. [ adjective ] not famous or acclaimed
Synonyms: unsung obscure
Examples:

"an obscure family" "unsung heroes of the war"

Related terms: inglorious
6. [ adjective ] not known before
Synonyms: strange
Examples:

"used many strange words" "saw many strange faces in the crowd" "don't let anyone unknown into the house"

Related terms: unfamiliar
7. [ noun ] anyone who does not belong in the environment in which they are found
Synonyms: stranger alien
Related terms: intruder foreigner
8. [ noun ] (mathematics) a variable whose values are solutions of an equation
Synonyms: unknown_quantity
Related terms: variable
Similar spelling:   Unknow
  unsown
  unknowing
  unknot
  unknowable