This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The condition of being uncertain; doubt.

n. Something uncertain: the uncertainties of modern life.

n. Statistics The estimated amount or percentage by which an observed or calculated value may differ from the true value.

n. doubt; the condition of being uncertain or without conviction.

n. Something uncertain or ambiguous.

n. (mathematics) A parameter that measures the dispersion of a range of measured values.

n. The quality or state of being uncertain.

n. That which is uncertain; something unknown.

n. The character or state of being uncertain; want of certainty.

n. Of persons: a state of doubt; a state in which one knows not what to think or do; hesitation; irresolution.

n. Something not certainly or exactly known; anything not determined, settled, or established; a contingency.

n. the state of being unsure of something

n. being unsettled or in doubt or dependent on chance

"For example, we use the term uncertainty all the time in science."

certainty   

doubt    precariousness    insecurity   

certainty   

anxiety    embarrassment    apprehension    sadness    frustration    weakness    tension    anger    terror    worry