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Adjective: infallible  in'fa-lu-bul
  1. Incapable of failure or error
    "an infallible antidote"; "an infallible memory"; "the Catholic Church considers the Pope infallible"; "no doctor is infallible"

See also: foolproof, inerrable, inerrant, infallibility, unerring, unfailing

Antonym: fallible

Encyclopedia: Infallible