Infallible
What it means
Incapable of making an error or failing.
Reach for it when naming an explicit absolute claim, often to question or limit it
No inspection method is infallible, so the bridge receives two independent checks.
Words to choose between 6
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playful
Fits when a process is designed to prevent common user mistakes
Careful Foolproof is disrespectful language and does not cover technical failure.
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everyday
Fits when confidence in one conclusion is the point
Careful Certain describes belief or outcome, not a general inability to err.
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warm
Fits when people can reasonably count on the person or tool
Careful Dependable is relational and does not mean perfect.
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professional
Fits when performance is consistent enough for the stated use
Careful Reliable allows a known failure rate and is usually the honest claim.
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formal
authoritative
Fits when recognized expertise supports reliance
Careful An authoritative source remains fallible and may become outdated.
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literary
Fits when judgment appears consistently correct
Careful Unerring is rhetorical and offers no evidence about missed cases.
Opposites 3
- fallible
- unreliable
- error-prone
Common phrases 3
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far from infallible
The early forecast was useful but far from infallible.
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infallible guide
The handbook is not an infallible guide to every local condition.
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consider infallible
The team refused to consider any single sensor infallible.
Usage notes
Keep in mind
Infallible is absolute. Positive copy should normally prefer reliable, validated, or a stated error rate.
Definitions and examples are written for this site. How words are chosen Recording: Dvortygirl, American accent, from Wikimedia Commons, CC BY-SA 3.0 Updated