For certain and Uncertain

Opposite meaning terms

For certain adverb - Definitely or positively (`sure' is sometimes used informally for `surely').

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Uncertain is an antonym for for certain in topics: certain, definite, without doubt.

Uncertain adjective - Likely to change frequently, suddenly, or unexpectedly.

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For certain is an antonym for uncertain.

Nearby Words: uncertainty, uncertainly

The insectoid design definitely is more efficient for certain tasks, like moving over uncertain terrain, and some have theorized that future space exploration will be done by means of insect-like autonomous drones.

Source: Unnecessarily Creepy Robot

Cite this Source

Uncertain and For certain. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/for_certain/uncertain

For certain & Uncertain. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/for_certain/uncertain>.

Uncertain or For certain. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/for_certain/uncertain.

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