UNCERTAINTY
uncertainty, uncertainness, precariousness
(noun) being unsettled or in doubt or dependent on chance; “the uncertainty of the outcome”; “the precariousness of his income”
doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness
(noun) the state of being unsure of something
Source: WordNet® 3.1
Etymology
Noun
uncertainty (countable and uncountable, plural uncertainties)
(uncountable) Doubt; the condition of being uncertain or without conviction.
(countable) Something uncertain or ambiguous.
(uncountable, mathematics) A parameter that measures the dispersion of a range of measured values.
Antonyms
• certainty
Source: Wiktionary
Un*cer"tain*ty, n.; pl. Uncertainties (.
1. The quality or state of being uncertain.
2. That which is uncertain; something unknown.
Our shepherd's case is every man's case that quits a moral certainty
for an uncertainty. L'Estrange.
Source: Webster’s Unabridged Dictionary 1913 Edition