uncertain

1. 1

   Not certain; unsure.

   • Conſider man without the protection and conduct of a ſuperior Being, and he is ſecure of nothing that he enjoys in this world, and uncertain of every thing that he hopes for.
2. 2

   Not known for certain; questionable.

   • Tomorrow's weather is uncertain.
3. 3

   Not yet determined; undecided.

4. 4

   Variable and subject to change.

5. 5

   Fitful or unsteady.

   • Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motio
6. 6

   Unpredictable or capricious.

   • O, woman! in our hours of ease, / Uncertain, coy, and hard to please, / And variable as the shade / By the light quivering aspen made; […]

ant. certain

1. 1

   Something uncertain; everything uncertain.uncountablewith-definite-article

   • Near-synonyms: uncertainty (countable sense), uncertainties
   • Their approach to the uncertain is laudable: they at least want to know the upper and lower bounds for what the answer could turn out to be.