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
Unreliable is an antonym for certain in topics: known, fixed, confident, undoubtable, referring to a specifically known amount.
Unreliable
Unreliable adjective - Not worthy of reliance or trust.
Usage example: in the early 1950s computers were large and expensive and unreliable
Nearby Words: unreliability, unreliably
Both words in one sentence
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Unreliable Narrator: The narrator often mentions that he remembers certain things with crystal clarity and others not at all.
Source: Literature / Murder Mysteries -
Unreliable Narrator: The narrator often says things that directly contradict what we actually see happen, most notably Lisa Hayes "volunteering" for a certain mission in Blind Game.
Source: Anime / Robotech -
We can't really tell for certain because all stories of his childhood are plagued by unreliable narrators.
Source: Used to Be a Sweet Kid
Cite this Source
Unreliable and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/unreliable
Certain & Unreliable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/unreliable>.
Unreliable or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/unreliable.
Google Ngram Viewer shows how "certain" and "unreliable" have occurred on timeline