uncertainty

/ʌnˈsɜːrtənti/
noun
  1. A feeling of doubt or not knowing what will happen.
    • Economic uncertainty often makes people save more money.
    • She felt a lot of uncertainty about her new job.
    • The uncertainty of the weather made planning the picnic difficult.
  2. A situation or fact that is not known or definite.
    • There are many uncertainties in starting a new business.
    • Scientists try to reduce uncertainties in their measurements.
    • The project faced uncertainties about funding.