Certain
Certain adjective - Having been established and usually not subject to change.
Usage example: a certain percentage of the profits will go to charity
Indefinite is an antonym for certain in topics: fixed, confident, undoubtable, referring to a specifically known amount.
Indefinite
Indefinite adjective - Not seen or understood clearly.
Usage example: through the dense fog we could just barely discern the indefinite form of another boat
Nearby Words: indefinable, indefinitely
Both words in one sentence
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On one hand, its most famous provision is one that allows warrantless indefinite detention for those suspected of terrorism in certain circumstances.
Source: Super-Fun Happy Thing of Doom -
Lazy Artist: While the characters are very well drawn and realistically proportioned, accusations that the author traced from photographs at certain points in the manga, have put it on indefinite hiatus.
Source: Manga / Prism
Cite this Source
Indefinite and Certain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/certain/indefinite
Certain & Indefinite. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/certain/indefinite>.
Indefinite or Certain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/certain/indefinite.
Google Ngram Viewer shows how "certain" and "indefinite" have occurred on timeline