Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not known or established; questionable.
  • adjective Not determined; undecided.
  • adjective Not having sure knowledge.
  • adjective Subject to change; variable.
  • adjective Unsteady; fitful.

from The Century Dictionary.

  • Not certain; doubtful.
  • Not known as regards quantity or extent; indefinite; problematical: as, an uncertain number of independent voters; a person of uncertain age.
  • Having doubts; without certain knowledge; not sure.
  • Not sure as to aim or effect desired.
  • Unreliable; insecure; not to be depended on.
  • Not firm or fixed; vague; indeterminate in nature; fluctuating.
  • Undecided; hesitating; not resolved.
  • Not steady; fitful.
  • Liable to change; fickle; inconstant; capricious; irresolute.
  • To make or cause to be uncertain.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb obsolete To make uncertain.
  • adjective Not certain; not having certain knowledge; not assured in mind; distrustful.
  • adjective Irresolute; inconsonant; variable; untrustworthy.
  • adjective Questionable; equivocal; indefinite; problematical.
  • adjective Not sure; liable to fall or err; fallible.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective not known for certain; questionable
  • adjective not yet determined; undecided
  • adjective variable and subject to change
  • adjective fitful or unsteady
  • adjective unpredictable or capricious

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective not established or confirmed
  • adjective not established beyond doubt; still undecided or unknown
  • adjective ambiguous (especially in the negative)
  • adjective subject to change
  • adjective not certain to occur; not inevitable
  • adjective not consistent or dependable
  • adjective lacking or indicating lack of confidence or assurance

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ certain

Examples

  • Analysts were reluctant to make predictions beyond one month because of what they described as an uncertain economic outlook given the central bank's ongoing efforts to tame inflation and as a string of interest-rate increases and other measures begin to bite.

    Growth Worries to Plague Chinese Shares

  • Most advanced economies are planning "significant fiscal adjustment" this year in what he described as an "uncertain economic environment."

    IMF Deputy Says Japan Can Learn From Euro Crisis

  • Kroger Co. reported its fiscal fourth-quarter earnings fell 27% on higher costs and offered a cautious outlook for the year amid what it described as the uncertain pace of economic recovery and tough price competition.

    Kroger Offers Cautious Outlook

  • Kroger Co. reported its fiscal fourth-quarter earnings fell 27% on higher costs and offered a cautious outlook for the year amid what it described as the uncertain pace of economic recovery and tough price competition.

    Kroger Offers Cautious Outlook

  • Kroger Co. reported its fiscal fourth-quarter earnings fell 27% on higher costs and offered a cautious outlook for the year amid what it described as the uncertain pace of economic recovery and tough price competition.

    Kroger Offers Cautious Outlook

  • Then he paused and drew back, his expression uncertain.

    City of Glass

  • Then he paused and drew back, his expression uncertain.

    Cassandra Clare: The Mortal Instrument Series

  • He seemed at times to assume he already had won the nomination, repeatedly using his questions to direct fire not at his rivals but at President Obama for what he called uncertain and even dangerous leadership.

    USATODAY.com News

  • Many high school teachers remain uncertain who is right about letting into AP, IB or

    High schoolers barred from college-level courses

  • We are living in uncertain times, that is for sure.

    Paso devaluation?

Comments

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  • Mr Dedalus, peering through his glasses towards the veiled sun, hurled a mute curse at the sky.

    -- It's as uncertain as a child's bottom, he said.

    Joyce, Ulysses, 6

    January 1, 2007

  • a town in Texas, USA

    February 27, 2008