Certain
Certain adjective - Impossible to avoid or evade.
Usage example: as he got older, the athlete began to feel the certain effects of the aging process on his body
Decided is a synonym for certain in fixed topic. In some cases you can use "Decided" instead an adjective "Certain", when it comes to topics like determined, true, inevitable.
Decided
Decided adjective - Not subject to misinterpretation or more than one interpretation.
Certain is a synonym for decided in determined topic. You can use "Certain" instead an adjective "Decided", if it concerns topics such as true, distinct, definite, inevitable.
Mutual synonyms
Both words in one sentence
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In particular, posing prepubescent girls for nude photos was in vogue when a certain well-known mathematician and writer of nonsense children's literature decided to get in on the photography craze.
Source: It's Not Porn, It's Art - High Class Gloves: The old money decided the type of gloves to wear at certain events.
Source: The Gilded Age -
Then they discovered a certain sleeping Eldritch Abomination and decided to tap its power instead... Well, let's just say it did not end well.
Source: Toxic Phlebotinum
Cite this Source
Decided and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/decided
Certain & Decided. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/decided>.
Decided or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/decided.
Google Ngram Viewer shows how "certain" and "decided" have occurred on timeline