adjective

infallible

in-FAL-uh-bul/ɪnˈfæləbl/

Unable to make mistakes or fail.

The archer seems infallible, hitting the exact center at every distance.

Depict infallible performance through an archer who never misses: a compact sequence shows the same woman hitting the exact center on every attempt as the shooting distance increases.

Etymology

inLatinnot

+fallLatindeceive

+ibleLatincapable of being

From fallere, “deceive,” fallible literally meant “able to be deceived,” hence liable to error. Adding “not” turns that vulnerability into exemption from error in judgment or knowledge.

In context

Allellu320:36

for the pupil must believe his mentor to be infallible, with him alone he is connected, his lessons only must be learned. Who can tell him that he has gone wrong, or who can set him right?

Proofs of a Conspiracy [Part 1 of 2] by John Robison | Full Audiobook, Read-Along

More examples

She treats his advice as infallible.
There is no infallible way to predict the weather.
The new software is useful, but it is hardly infallible.

Forms

infallible

infallibility noun — The state of being incapable of error.

infallibly adverb — Without making mistakes or ever failing.

Similar words

unerring: Emphasizes consistently accurate judgment or action rather than guaranteed perfection.
foolproof: Describes something designed to prevent failure even when used incorrectly.