Infallible

/ɪnˈfælɪbəl/

Meaning & Definition

adjective

Incapable of making mistakes or being wrong.

The scientist believed her methods were infallible, guaranteeing accurate results.

Certain to happen; inevitable.

With his infallible logic, he proved that the outcome was a certainty.

From Latin 'infallibilis', meaning 'not able to fall' or 'not liable to fail'.

infallible authority:

An authority that is believed to be incapable of making errors.

infallible proof:

Evidence that is beyond doubt; absolutely certain.

Perfect or foolproof.

That plan is infallible; I can't see it going wrong.

Guaranteed to succeed.

He's got an infallible way to win at that game.