Un certainly


not definitely ascertainable or fixed, as in time of occurrence, number, dimensions, or quality.
not confident, assured, or free from hesitancy: an uncertain smile.
not clearly or precisely determined; indefinite; unknown: a manuscript of uncertain origin.
vague; indistinct; not perfectly apprehended: an abstruse novel with uncertain themes.
subject to change; variable; capricious; unstable: a person of uncertain opinions.
ambiguous; unreliable; undependable: Her loyalties are uncertain.
dependent on chance or unpredictable factors; doubtful; of unforeseeable outcome or effect.
unsteady or flickering, as light; of changing intensity or quality.

1250–1300; Middle English; see un-1, certain

uncertainly, adverb
uncertainness, noun

1. unsure, unpredictable. Uncertain, insecure, precarious imply a lack of predictability. That which is uncertain is doubtful or problematical; it often involves danger through an inability to predict or to place confidence in the unknown: The time of his arrival is uncertain. That which is insecure is not firm, stable, reliable, or safe, and hence is likely to give way, fail, or be overcome: an insecure foundation, footing, protection. Precarious suggests great susceptibility to failure, or exposure to imminent danger: a precarious means of existence. 3. unsettled, undetermined. 8. irregular.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
uncertain (ʌnˈsɜːtən)
adj (when postpositive, often foll by of)
1.  not able to be accurately known or predicted: the issue is uncertain
2.  not sure or confident (about): a man of uncertain opinion
3.  not precisely determined, established, or decided: uncertain plans
4.  not to be depended upon; unreliable: an uncertain vote
5.  liable to variation; changeable: the weather is uncertain
6.  in no uncertain terms
 a.  unambiguously
 b.  forcefully

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "of indeterminate time or occurrence," from un- (1) "not" + certain (adj.). Meaning "not fully confident" is recorded from late 14c. (implied in uncertainty).
Online Etymology Dictionary, © 2010 Douglas Harper
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