Antonyms of noun certainty

2 senses of certainty

Sense 1
certainty -- (the state of being certain; "his certainty reassured the others")
       Antonym of uncertainty (Sense 2)
      => doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness -- (the state of being unsure of something)

Sense 2
certainty, sure thing, foregone conclusion -- (something that is certain; "his victory is a certainty")
       Antonym of uncertainty (Sense 1)
      => uncertainty, uncertainness, precariousness -- (being unsettled or in doubt or dependent on chance; "the uncertainty of the outcome"; "the precariousness of his income")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun certainty

2 senses of certainty

Sense 1
certainty -- (the state of being certain; "his certainty reassured the others")
       => cognitive state, state of mind -- (the state of a person's cognitive processes)

Sense 2
certainty, sure thing, foregone conclusion -- (something that is certain; "his victory is a certainty")
       => quality -- (an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare)