infallible

1. Incapable of failure or error (synset 300968095)
   "an infallible antidote"; "an infallible memory"; "the Catholic Church considers the Pope infallible"; "no doctor is infallible"
   similar to:

   • foolproof, unfailing - not liable to failure
   • inerrable, inerrant, unerring - not liable to error

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