CEFR C1

infallible

adjective

Meaning

Incapable of making mistakes or being wrong; absolutely trustworthy or certain.

Examples

  • Even the most experienced surgeons are not infallible; errors can sometimes occur.
  • Many people believe that the legal system should be infallible, but human judgment is always involved.

Synonyms: unerring, unmistakable, flawless, impeccable