Dubious and Sure

Opposite meaning words

Dubious adjective - Giving good reason for being doubted, questioned, or challenged.

Usage example: any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least

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Sure is an antonym for dubious in topics: unsure, doubtful, vague.

Nearby Words: dubiety, dubiousness, dubiously

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

Nearby Word: surely

I'm not sure that this is completely accurate, but if he wishes to claim this dubious distinction, I'm all for letting him have it.

Source: Music / Duke Ellington
Well he'll be sure to give you some sort of morally dubious gun to do some damage.

Source: Crazy Awesome / Comic Books
When the Rat has to go back in time, they're not even sure of the name: "Dirt, or Earth, or something" and dubious of its claim to be the ancestral home of mankind.

Source: Insignificant Little Blue Planet

Cite this Source

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

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

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

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