# infallible

/ˌɪnˈfæɫəbəɫ/ (US) · /ɪnfˈæləbəl/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/infallible
Updated: 2026-05-11

## Definition

never making mistakes and always being right. It describes someone or something that is perfect and cannot fail.

For teachers: incapable of making errors or being wrong. Often used to describe systems, logic, or authorities that are considered beyond question.

## Examples

- No human being is truly infallible.
- The scientist admitted that even the most advanced computer models are not infallible and can produce incorrect results.
- While the leader projected an image of being infallible, the subsequent collapse of the policy revealed deep flaws in his initial reasoning.

## Usage notes

- Often used predicatively after linking verbs like 'be' or 'seem'.

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