Certainty
Certainty noun - A state of mind in which one is free from doubt.
Usage example: I have full certainty that I'll pass the test
Uncertainty is an antonym for certainty in topics: inevitability, confidence, fact, positive assurance.
Uncertainty
Uncertainty noun - A feeling or attitude that one does not know the truth, truthfulness, or trustworthiness of someone or something.
Usage example: uncertainty about her job prospects has her worried
Nearby Words: uncertain, uncertainly
How words are described
Both words in one sentence
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While that trope overlaps with this one, it generally involves an honest uncertainty, while this one is about dishonest certainty ("Of course I know that gazebos are something you eat.")
Source: I've Heard of That What Is It? - The fourth state, one that only Pinkie, AJ and the Flutters have at least partially reached with certainty (there's still an element of uncertainty with the rest of the mane cast).
Source: Analysis / Pony POV Series -
Done when an artist or writer wants to use a character but for whatever reason isn't allowed to at the present time, especially due to uncertainty of ownership, or else certainty that that character is trademarked into someone else's continuity and isn't going to be loaned out.
Source: Captain Ersatz
Cite this Source
Uncertainty and Certainty. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certainty/uncertainty
Certainty & Uncertainty. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certainty/uncertainty>.
Uncertainty or Certainty. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certainty/uncertainty.
Google Ngram Viewer shows how "certainty" and "uncertainty" have occurred on timeline