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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 ?
Statements contained in this news release that are not historical facts are forward-looking statements, which are subject to a number of known and unknown risks, uncertainness and other factors that may cause the actual results to differ materially from those anticipated in our forward-looking statements.
During this meeting, literature data were reviewed and discussed by the entire group, and if any controversies occurred, the list of clinical scenarios was better redefined to avoid uncertainness in the rating procedures.
However, some weaknesses exist in the theory of LCA, particularly the uncertainness of data quality and model [8].
Uncertainness of human is not only each individual difference but also effort input in human-robot collaboration.
This concept is highly similar to Leon Festinger's (1957) theory of cognitive dissonance, where people actively avoid disconfirming information due to their dislike of feeling uncertainness or ambiguity.