uncertainty > define

noun

• Being unsettled or in doubt or dependent on chance.
  • usage: "the uncertainty of the outcome"; "the precariousness of his income"
  • synonyms: uncertainness, precariousness
• The state of being unsure of something.
  • synonyms: doubt, incertitude, dubiety, doubtfulness, dubiousness

• (n.) The quality or state of being uncertain.
• (n.) That which is uncertain; something unknown.

Usually refers to risk or volatility.