Definitions for uncertainness
Random House Webster's College Dictionary
not known precisely; not fixed, as in time of occurrence, number, or size.
not confident or assured; hesitant.
not clearly determined; unknown:
a manuscript of uncertain origin.
vague or indistinct.
Origin of uncertain:
uncertainty, uncertainness, precariousness(noun)
being unsettled or in doubt or dependent on chance
"the uncertainty of the outcome"; "the precariousness of his income"
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"uncertainness." Definitions.net. STANDS4 LLC, 2013. Web. 20 May 2013. <http://www.definitions.net/definition/uncertainness>.