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.

fallible

Capable of making mistakes or being wrong.

error

A mistake or inaccuracy.

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.