infallible
adjective /ɪnˈfæləbl/
/ɪnˈfæləbl/
- never wrong; never making mistakes
- infallible advice
- Doctors are not infallible.
- that never fails; always doing what it is supposed to do
- an infallible method of memorizing things
Word Originlate 15th cent.: from French infaillible or late Latin infallibilis, from in- ‘not’ + Latin fallere ‘deceive’.