"Fallible" means capable of making mistakes — or, easier to remember — capable of failing. Infallible means exactly the opposite — incapable of failing.

This word is often used to describe human capacity for error — no one is infallible. And yet, we are able to be infallible in certain ways: children are infallibly curious, teenagers infallibly hungry. Interestingly, infallible derives from the Latin in- "not" + fallere "deceive." When did making a mistake and deception become the same thing?

Definitions of infallible
  1. adjective
    incapable of failure or error
    “an infallible antidote”
    “an infallible memory”
    “no doctor is infallible
    foolproof, unfailing
    not liable to failure
    inerrable, inerrant, unerring
    not liable to error
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    likely to fail or make errors
    straying from the right course or from accepted standards
    erring, error-prone
    capable of making an error
    undependable, unreliable
    liable to be erroneous or misleading
    likely to fail under stress or pressure
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