Sure
Sure adjective - Not capable of being challenged or proved wrong.
Usage example: no sure evidence that life exists on other planets
Undeniable is a synonym for sure in certain topic. In some cases you can use "Undeniable" instead an adjective "Sure", when it comes to topics like unquestionable. popular alternative
Nearby Word: surely
Undeniable
Undeniable adjective - Not capable of being challenged or proved wrong.
Usage example: undeniable evidence of guilt
Sure is a synonym for undeniable in certain topic. You can use "Sure" instead an adjective "Undeniable", if it concerns topics such as definite. popular alternative
Nearby Word: undeniably
Mutual synonyms
Both words in one sentence
- Over time, just about everyone who's not Austria is sure that Hungary is Dead All Along, with the Nation himself refusing to give up hope until there's undeniable proof.
Source: Fanfic / 1983: Doomsday Stories
Cite this Source
Undeniable and Sure. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/sure/undeniable
Sure & Undeniable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/sure/undeniable>.
Undeniable or Sure. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/sure/undeniable.
Google Ngram Viewer shows how "sure" and "undeniable" have occurred on timeline