Certain
Certain adjective - Having or showing a mind free from doubt.
Usage example: I'm certain that they'll arrive on time
Sure is a synonym for certain in confident topic. In some cases you can use "Sure" instead the word "Certain" as an adjective or a verb, when it comes to topics like behaviour, property, character trait, fixed. popular alternative
Sure
Sure adjective - Having or showing a mind free from doubt.
Usage example: are you absolutely sure that she said she was coming today?
Certain is a synonym for sure in confident topic. You can use "Certain" instead the word "Sure" as an adjective or a verb, if it concerns topics such as inevitable, behaviour, property, character trait. popular alternative
Nearby Word: surely
Mutual synonyms
Both words in one sentence
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Made even more suicidal by the decision to go about it by frontal assault in broad daylight and on horseback, so that you're sure and certain the enemy's archers won't miss you.
Source: Suicide Mission -
Also, certain people can sometimes see through the Mask — the insane, those who are high, fetches, very young children, people with certain forms of brain damage... it's not a sure thing, though.
Source: Glamour Failure - Unfortunately, this trick failed when Kazuo Kiriyama made sure to put a bullet in his brain to be certain.
Source: Make Sure He's Dead
Cite this Source
Sure and Certain. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/certain/sure
Certain & Sure. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/certain/sure>.
Sure or Certain. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/certain/sure.
Google Ngram Viewer shows how "certain" and "sure" have occurred on timeline