1. being or having an unknown or unnamed source

    Synonyms : nameless, unidentified, unnamed
    Examples :
    • a poem by an unknown author
  2. not famous or acclaimed

    Synonyms : obscure, unsung
  3. anyone who does not belong in the environment in which they are found

    Synonyms : alien, stranger
    Type Of : intruder, interloper, trespasser
  4. not known before

    Synonyms : strange
    Examples :
    • don't let anyone unknown into the house
  5. an unknown and unexplored region

    Synonyms : terra incognita, unknown region
    Type Of : region
    Examples :
    • they came like angels out the unknown
  6. a variable whose values are solutions of an equation

    Synonyms : unknown quantity
    Type Of : variable
  7. not known

    Antonyms : known
    Examples :
    • an unknown amount
    • an unknown island
    • an unknown writer
    • an unknown source
  8. not known to exist

    Examples :
    • things obscurely felt surged up from unknown depths


  1. being definitely out of the ordinary and unexpected; slightly odd or even a bit weird

    Synonyms : strange
  2. not commonly encountered

    Examples :
    • two-career families are no longer unusual
  3. not usual or common or ordinary

    Antonyms : usual
    Examples :
    • a scene of unusual beauty
    • a man of unusual ability
    • cruel and unusual punishment
    • an unusual meteorite


  1. free from undue bias or preconceived opinions

    Synonyms : impartial
    Antonyms : prejudiced
    Examples :
    • an unprejudiced appraisal of the pros and cons


  1. the quality of lacking diversity or variation (even to the point of boredom)

    Synonyms : uniformness
    Antonyms : nonuniformity
    Type Of : similarity
  2. a condition in which everything is regular and unvarying

    Type Of : regularity


  1. a university student who has not yet received a first degree

    Synonyms : undergrad
    Type Of : college boy, college man, collegian


  1. free from physical or moral spots or stains

    Synonyms : unmarred, unmutilated
    Antonyms : blemished
    Examples :
    • an unblemished record
    • an unblemished complexion


  1. liquid excretory product

    Synonyms : pee, piddle, piss, water, weewee
    Type Of : body waste, excrement, excreta, excretion, excretory product
    Examples :
    • there was blood in his urine


  1. bring to the latest state of technology or supply with the latest data

    Type Of : modify
    Examples :
    • tonight, I will update my operating system
    • we updated the database with the most recent figures
  2. bring up to date; supply with recent information

    Type Of : inform
  3. information or data that updates

    Type Of : information, info
    Examples :
    • do you have the latest software update?
    • I just heard the update on the unemployment figures
  4. modernize or bring up to date

    Type Of : modify
    Examples :
    • We updated the kitchen in the old house
  5. the act of bringing someone or something up to date

    Type Of : activity
    Examples :
    • the server update ran overnight
    • the local news station broadcast a special weather update


  1. stir up (water) so as to form ripples

    Synonyms : cockle, riffle, ripple, ruffle
    Type Of : flux, flow
  2. move in a wavy pattern or with a rising and falling motion

    Synonyms : flap, roll, wave
    Type Of : move
    Examples :
    • The curtains undulated
  3. occur in soft rounded shapes

    Synonyms : roll
  4. increase and decrease in volume or pitch, as if in waves

    Type Of : change
    Examples :
    • The singer's voice undulated
  5. having a wavy margin and rippled surface


  1. the use of uttered sounds for auditory communication

    Synonyms : vocalization
    Type Of : auditory communication