1
as in unerring
not being or likely to be wrong
a teacher with an infallible memory for names
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in reliable
not likely to fail
an infallible cure for hiccups
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of infallible
Similar to human drivers, Zoox's AI and safety systems aren't infallible, but the test ride vehicle didn't exhibit any odd behaviors that seemed problematic or scary for occupants.
—
Charles Singh,
USA Today,
11 May 2026
The presumption that my doctor was infallible.
—
Nick Lichtenberg,
Fortune,
3 May 2026
The drones are not infallible because the wind — or other drones — can cause the cables to tangle.
—
ABC News,
30 Apr. 2026
Not a great job, mind you, and certainly not an infallible one.
—
Sean McIndoe,
New York Times,
24 Apr. 2026
See All Example Sentences for infallible
Charles Singh,
USA Today,
11 May 2026
The presumption that my doctor was infallible.
—
Nick Lichtenberg,
Fortune,
3 May 2026
The drones are not infallible because the wind — or other drones — can cause the cables to tangle.
—
ABC News,
30 Apr. 2026
Not a great job, mind you, and certainly not an infallible one.
—
Sean McIndoe,
New York Times,
24 Apr. 2026
See All Example Sentences for infallible
Recent Examples of Synonyms for infallible
Adjective
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Ditto Hugh Jackman’s unerring performance — perhaps his finest dramatic work yet — as a savage, unfeeling thug and unrepentant murderer and thief.
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Sir Charles, the Chuckwagon, the Round Mound of Rebound, has an unerring talent for getting to the point.
Adjective
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But the systems are only as reliable as their sources, and are prone to misinformation and manipulation.
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Amodei predicts that, over the next five to ten years, AI will achieve, among other things, the reliable prevention and treatment of nearly all natural infectious disease, the elimination of most cancer, the prevention of Alzheimer’s and a doubling of the human lifespan.
Adjective
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The season’s final visit by the defending World Series champs coaxed the first sellout crowd of the season for the Minnesota Twins on a perfect summer evening.
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Neither butter nor margarine is perfect, and both have potential drawbacks.
Adjective
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Their reach was owed not just to the nine-member unit’s technical excellence and versatility but also their endless supply of positivity, of psychedelic Black power characterized by its leader’s unfailing belief in a beautiful tomorrow.
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His unfailing commitment to civilian authority gave time for government institutions to sink roots, and established norms that gelled into the professional ethos of our military today.
Adjective
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Thousands of five-star reviews attest to their high-quality, expensive feel and flawless fit.
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When a mouse costs more than $100, buyers expect premium materials, advanced software, and near-flawless execution.
Adjective
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An investigation by the National Transportation Safety Board (NTSB) found that the driver failed to make sure the tracks were clear.
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Make sure the shiny, reflective side is facing out.
Cite this Entry
“Infallible.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infallible. Accessed 29 Jun. 2026.
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