Definition of infallible adjective from the Oxford Advanced Learner's Dictionary

     

    infallible

     adjective
    adjective
    BrE BrE//ɪnˈfæləbl//
     
    ; NAmE NAmE//ɪnˈfæləbl//
     
     
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  1. 1never wrong; never making mistakes infallible advice Doctors are not infallible. opposite fallible
  2. 2that never fails; always doing what it is supposed to do an infallible method of memorizing things
  3. Word Origin late 15th cent.: from French infaillible or late Latin infallibilis, from in- ‘not’ + Latin fallere ‘deceive’.
See the Oxford Advanced American Dictionary entry: infallible