Sure and Unsure

Opposite meaning words

Sure adjective - Having or showing a mind free from doubt.

Usage example: are you absolutely sure that she said she was coming today?

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Unsure is an antonym for sure in topics: certain, inevitable, self-confident, physically stable.

Nearby Word: surely

Unsure adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.

Usage example: unsure of her ability to handle the pressure of competing in the Olympic Games

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Sure is an antonym for unsure in doubtful topic.

The Kingpin (Sega Genesis port for sure, unsure about the others), when Spidey reaches the bomb, he must fight every one of the villains he has faught thus far.

Source: Boss Rush
Gideon has a inversion; He was unsure that he (Gideon) was really The Chosen One and wanted to make sure before he went off starting a war.

Source: God Test
In particular, a Lombre is unsure whether or not he wants to evolve into a Ludicolo, because Ludicolo are carefree Pokemon, and he isn't sure if he wants to be carefree.

Source: The Mind Is a Plaything of the Body

Cite this Source

Unsure and Sure. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/sure/unsure

Sure & Unsure. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/sure/unsure>.

Unsure or Sure. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/sure/unsure.

Google Ngram Viewer shows how "sure" and "unsure" have occurred on timeline