Infallible
adj.capable, thoughtfulformal
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.
Choose between these
6- playful
a process is designed to prevent common user mistakes
not when Foolproof is disrespectful language and does not cover technical failure.
- everyday
confidence in one conclusion is the point
not when Certain describes belief or outcome, not a general inability to err.
- warm
people can reasonably count on the person or tool
not when Dependable is relational and does not mean perfect.
- professional
performance is consistent enough for the stated use
not when Reliable allows a known failure rate and is usually the honest claim.
- formal
authoritative
recognized expertise supports reliance
not when An authoritative source remains fallible and may become outdated.
- literary
judgment appears consistently correct
not when Unerring is rhetorical and offers no evidence about missed cases.
Said against
3- fallible
- unreliable
- error-prone
It naturally appears in
3- far from infallible
The early forecast was useful but far from infallible.
- infallible guide
The handbook is not an infallible guide to every local condition.
- consider infallible
The team refused to consider any single sensor infallible.
Where this comes from
Infallible is absolute. Positive copy should normally prefer reliable, validated, or a stated error rate.
- Merriam-Webster, adjective sense 1: incapable of error opens in a new tab · retrieved 2026-07-26
The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.