Certain
Certain adjective - Having or showing a mind free from doubt.
Usage example: I'm certain that they'll arrive on time
Indecisive is an antonym for certain.
Indecisive
Indecisive adjective - Characterized by lack of decision and firmness.
Nearby Words: indecision, indecisively
Both words in one sentence
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Indecisive Medium A work in a certain medium behaves as if it was in another medium.
Source: Absurdity Ascendant - Compare Indecisive Parody, where due to some reason it's not really certain whether the work is a parody at all.
Source: Denied Parody
Cite this Source
Indecisive and Certain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/certain/indecisive
Certain & Indecisive. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/certain/indecisive>.
Indecisive or Certain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/certain/indecisive.
Google Ngram Viewer shows how "certain" and "indecisive" have occurred on timeline