Certain
Certain adjective - Not capable of being challenged or proved wrong.
Usage example: up to this point there's been no certain evidence that a crime has been committed
Undeniable is a synonym for certain in known topic. In some cases you can use "Undeniable" instead an adjective "Certain", when it comes to topics like unquestionable, indisputable, undoubtable. popular alternative
Undeniable
Undeniable adjective - Not capable of being challenged or proved wrong.
Usage example: undeniable evidence of guilt
Certain is a synonym for undeniable in definite topic. You can use "Certain" instead an adjective "Undeniable", if it concerns topics such as sure, indisputable, inevitable. popular alternative
Nearby Word: undeniably
Mutual synonyms
Related pairs
- clear and certain
- clear and undeniable
- positive and certain
- positive and undeniable
- true and certain
- true and undeniable
- obvious and certain
- obvious and undeniable
- definite and certain
- definite and undeniable
- reliable and certain
- reliable and undeniable
- unquestionable and certain
- unquestionable and undeniable
Both words in one sentence
- The link between obesity and type 2 DM is undeniable, and while obesity is not certain to cause diabetes in all cases, it clearly looks like a big contributor.
- No one is certain how it began, but the end is undeniable.
Source: Webcomic / The Other Grey Meat
Cite this Source
Undeniable and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/undeniable
Certain & Undeniable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/undeniable>.
Undeniable or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/undeniable.
Google Ngram Viewer shows how "certain" and "undeniable" have occurred on timeline