Sure and Undefined

Opposite meaning words

sentence examples

Sure

Sure adjective - Having or showing a mind free from doubt.
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Synonyms for Sure
Antonyms for Sure
Undefined is an antonym for sure.
Nearby Word: surely

Undefined

Undefined adjective - Not seen or understood clearly.
Usage example: plagued by undefined worries that kept her awake at night
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Synonyms for Undefined
Antonyms for Undefined
Sure is an antonym for undefined in topics: infinite, vague.
Similar words of sure

Similar words of undefined

Both words in one sentence

  • Improbably Female Cast It's becoming an Enforced Trope, at that, as ZUN originally intended the Final Boss of Undefined Fantastic Object to be a man, but discarded that idea because he wasn't sure how well it would go over.
    Source: Improbably Female Cast
Cite this Source
Undefined and Sure. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/sure/undefined
Sure & Undefined. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/sure/undefined>.
Undefined or Sure. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/sure/undefined.

Antonyms for sure


Antonyms for undefined

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