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1. Not known or established; questionable: domestic changes of great if uncertain consequences.
2. Not determined; undecided: uncertain plans.
3. Not having sure knowledge: an uncertain recollection of the sequence of events.
a. Subject to change; variable: uncertain weather.
b. Unsteady; fitful: uncertain light.

un·cer′tain·ly adv.
un·cer′tain·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.uncertainness - being unsettled or in doubt or dependent on chanceuncertainness - being unsettled or in doubt or dependent on chance; "the uncertainty of the outcome"; "the precariousness of his income"
quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
doubt, doubtfulness, dubiousness, question - uncertainty about the truth or factuality or existence of something; "the dubiousness of his claim"; "there is no question about the validity of the enterprise"
indefiniteness, indefinity, indeterminacy, indeterminateness, indetermination - the quality of being vague and poorly defined
unpredictability - lacking predictability
improbability, improbableness - the quality of being improbable; "impossibility should never be confused with improbability"; "the improbability of such rare coincidences"
fortuitousness - the quality of happening accidentally and by lucky chance
speculativeness - the quality of being a conclusion or opinion based on supposition and conjecture rather than on fact or investigation; "her work is highly contentious because of its speculativeness and lack of supporting evidence"
References in periodicals archive ?
Uncertainness in the etiology of CP/CPPS led to investigation of some diet and lifestyle factors that were thought to correlate with this problem [25].
It is precisely the uncertainness of the outcomes of her training and its non-identifiable future that engenders the scariness of her presence qua learning qua subjectification.
JMT CEO Piya Pong-acha said the political uncertainness had left many funding agencies unprepared to bear risks, resulting in their sale of bad debt since early this year.