incapable of error

See: infallible
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We are all, by any practical definition of the words, foolproof and incapable of error.
However, even with these developments anyone who suggests that our system is incapable of error is living in a dream world.
Supporters believe he is incapable of error and answerable only to God.
Tireless and incapable of error, the virtual dancer gradually refines the movements of his flock until the only gesture they're left capable of is pushing "enter" on a keyboard.