unknown

If something is unknown, it's not familiar understood, like the unknown path through the woods you've never explored or your brother's unknown reasons for staying late after school.

When you're aware ofor familiar with something, you can describe it as known. Add the prefix un-, or "not," and you get unknown. You'll often find this adjective in the phrase "unknown territory," as in "I totally understand algebra, but calculus is unknown territory." And as a noun, the unknown sometimes represents a whole category of mysterious things: "Our fear of the unknown keeps us from traveling to new places."

Definitions of unknown
  1. adjective
    not known
    “an unknown amount”
    “an unknown island”
    “an unknown writer”
    “an unknown source”
    Synonyms:
    unacknowledged
    not recognized or admitted
    unfamiliar
    not known or well known
    inglorious
    not bringing honor and glory
    chartless, uncharted, unmapped
    (of unknown regions) not yet surveyed or investigated
    little-known
    unknown to most people
    unbeknown, unbeknownst
    (usually used with `to') occurring or existing without the knowledge of
    undiagnosed
    eluding diagnosis
    undiscovered, unexplored
    not yet discovered
    unheard-of
    previously unknown
    unidentified
    not yet identified
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    Antonyms:
    known
    apprehended with certainty
    acknowledged
    recognized or made known or admitted
    familiar
    well known or easily recognized
    glorious
    having or deserving or conferring glory
    best-known
    most familiar or renowned
    better-known
    more familiar or renowned than the other of two
    celebrated, famed, famous, far-famed, illustrious, notable, noted, renowned
    widely known and esteemed
    identified
    having the identity known or established
    legendary
    so celebrated as to having taken on the nature of a legend
    proverbial
    widely known and spoken of
    well-known
    widely or fully known
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  2. adjective
    not known to exist
    “things obscurely felt surged up from unknown depths”
    Synonyms:
    unsuspected
    not suspected or believed likely
  3. adjective
    not known before
    “don't let anyone unknown into the house”
    synonyms: strange
    unfamiliar
    not known or well known
  4. adjective
    being or having an unknown or unnamed source
    “a poem by an unknown author”
    synonyms: nameless, unidentified, unnamed
    anon., anonymous
    having no known name or identity or known source
  5. adjective
    not famous or acclaimed
    synonyms: obscure, unsung
    inglorious
    not bringing honor and glory
  6. noun
    an unknown and unexplored region
    “they came like angels out the unknown
    synonyms: terra incognita, unknown region
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    type of:
    region
    a large indefinite location on the surface of the Earth
  7. noun
    anyone who does not belong in the environment in which they are found
    synonyms: alien, stranger
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    Antonyms:
    acquaintance, friend
    a person with whom you are acquainted
    types:
    foreigner, outsider
    someone who is excluded from or is not a member of a group
    transalpine
    one living on or coming from the other side of the Alps from Italy
    type of:
    interloper, intruder, trespasser
    someone who intrudes on the privacy or property of another without permission
  8. noun
    a variable whose values are solutions of an equation
    synonyms: unknown quantity
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    type of:
    variable
    a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
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