infallible infallible /ˌɪnˈfæləbəl/

adjective

1. () Incapable of failure or error  ( infallible )
   incapable of failure or error
    An infallible antidote
   an infallible antidote
    An infallible memory
   an infallible memory
    The Catholic Church considers the Pope infallible
   the Catholic Church considers the Pope infallible
    No doctor is infallible
   no doctor is infallible