Certain and Iffy

Opposite meaning words

Certain adjective - Not capable of being challenged or proved wrong.

Usage example: up to this point there's been no certain evidence that a crime has been committed

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Iffy is an antonym for certain.

Nearby Words: certainty, certainly

Iffy adjective - Subject to accident or chance or change.

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Certain is an antonym for iffy in uncertain topic.

That, or if the number is never revealed, like Undisclosed Funds, this can avoid numbers that can sound dated due to inflation, or have an iffy impact due to the fact that the audience likely contains people who find certain sums less exciting than other people do.

Source: Silent Offer

Cite this Source

Iffy and Certain. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/certain/iffy

Certain & Iffy. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/certain/iffy>.

Iffy or Certain. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/certain/iffy.

Google Ngram Viewer shows how "certain" and "iffy" have occurred on timeline