Infallible
Infallible adjective - Not being or likely to be wrong.
Usage example: a teacher with an infallible memory for names
Sure is a synonym for infallible in certain topic. In some cases you can use "Sure" instead the word "Infallible" as an adjective or a noun, when it comes to topics like unfailing, property, character trait, unerring. popular alternative
Nearby Words: infallibly, infallibility
Sure
Sure adjective - Not likely to fail.
Usage example: a sure cure for the winter blues—a week in the Bahamas
Infallible is a synonym for sure in certain topic. You can use "Infallible" instead the word "Sure" as an adjective or a noun, if it concerns topics such as inevitable, property, character trait, reliable. popular alternative
Nearby Word: surely
Mutual synonyms
Both words in one sentence
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It usually depends on the writer, though, since he's far from an infallible example: several stories also have him being immediately shot down by the women he hits on despite being sure of his charmer skills.
Source: Comic Book / Monica's Gang -
The game advises you to head to the nearest tavern if you're looking for work; even if nobody has a quest for you, you're sure to overhear a snippet of Infallible Babble about a nearby location from the barman or patrons.
Source: The Need for Mead
Cite this Source
Sure and Infallible. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/infallible/sure
Infallible & Sure. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/infallible/sure>.
Sure or Infallible. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/infallible/sure.
Google Ngram Viewer shows how "infallible" and "sure" have occurred on timeline