For certain and Questionable

Opposite meaning terms

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

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Questionable is an antonym for for certain in topics: certain, definite.

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

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For certain is an antonym for questionable.

Cite this Source

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

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

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

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