unknown

Noun · Adjective

US[uhn-nohn]/ənˈnoʊn/2 syllables

Open English WordNet

not known“an unknown amount”“an unknown island”“an unknown writer”“an unknown source”Opposite knownSimilar undiscovered, unbeknown, undiagnosed, chartless, unheard-of, little-known, unidentifiedSee also unacknowledged, unfamiliar, inglorious
being or having an unknown or unnamed source“a poem by an unknown author”“corporations responsible to nameless owners”“an unnamed donor”Synonyms: nameless unidentified unnamedOpposite onymousSimilar anonymous, anon.
not known to exist“things obscurely felt surged up from unknown depths”Opposite suspectedSimilar unsuspected
not famous or acclaimed“an obscure family”“unsung heroes of the war”Synonyms: obscure unsungOpposite gloriousSimilar inglorious
not known before“used many strange words”“saw many strange faces in the crowd”“don't let anyone unknown into the house”Synonyms: strangeOpposite familiarSimilar unfamiliar

an unknown and unexplored region“they came like angels out of the unknown”Synonyms: unknown region terra incognitaType of region
anyone who does not belong in the environment in which they are foundSynonyms: stranger alienType of intruder, interloperKinds foreigner, outsider
a variable whose values are solutions of an equationSynonyms: unknown quantityType of variable

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The main translation for each meaning, from the langtolang.com multilingual dictionary. Each word links to its full entry there.

Un·known′ adjective

Not known; not apprehended. — Un·known′wb-a1′>′ness, noun rare William Camden

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54