For certain and Questionably

Opposite meaning terms

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

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Questionably is an antonym for for certain in topics: accurately, without doubt.

Questionably adverb - In a questionable and dubious manner.

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For certain is an antonym for questionably.

Cite this Source

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

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

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

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