Sure
Sure adjective - Impossible to avoid or evade.
Usage example: the joke's a sure dud if you don't pause in the right places
Unreliable is an antonym for sure.
Nearby Word: surely
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: I'd give the example's name, but I'm pretty sure he lied about that too.
Source: Literature / Pale Fire - Unreliable Narrator: She sure does seem to have a bias towards the cuter Pokémon.
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Unreliable Narrator: In the early chapters, when the perspective shifts to that of any of the antagonists, each one of them is absolutely sure that Shinji is just a puppet of his father.
Cite this Source
Unreliable and Sure. (2016). Retrieved 2022, August 17, from https://thesaurus.plus/related/sure/unreliable
Sure & Unreliable. N.p., 2016. Web. 17 Aug. 2022. <https://thesaurus.plus/related/sure/unreliable>.
Unreliable or Sure. 2016. Accessed August 17, 2022. https://thesaurus.plus/related/sure/unreliable.
Google Ngram Viewer shows how "sure" and "unreliable" have occurred on timeline