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Infallible

Not capable of failing; unable to make mistakes.

adjective

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Imagine This

The robot working in a car manufacturing plant has been tested and proven to be incapable of failing or making mistakes.

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Sounds Like

in-FAL-uh-buhl

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Looks Like

In(not) + fallible → Not able to fail or make mistakes; -able is a suffix meaning capable of

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Remember This

Originates from Latin infallibilis (not fallible); historically associated with the concept of papal infallibility in Catholic doctrine.

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Other Forms

Infallibilitynoun

Infalliblyadverb

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Connect With

fallible, reliable, unerring, faultless, impeccable

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Note

Avoid assuming infallibility of people; use primarily for systems, logic, or memories. In everyday speech, infallible is often exaggerated; in formal contexts it should be used cautiously.

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Study Deeper

Examples

The safety protocol was claimed to be infallible, but engineers later found a rare exception.
Her memory seemed infallible, recalling minute details of every meeting.

Synonyms

unerringfaultlessflawlessimpeccablefoolproof

Antonyms

fallibleimperfectdefective

Etymology

From Latin infallibilis, in- (not) + fallibilis (liable to err), from fallere (to err, deceive).

Mnemonic

IN + FALLIBLE: Remember that infallible means not able to fall into error; think of a vault that never falls, always true.