infallible
adjectiveUK /ɪnˈfæl.ə.bəl/
US /ɪnˈfæl.ə.bəl/
Never making a mistake or being wrong.
The old captain believed his map was infallible, so he never checked it twice.
RELATED WORDS
OTHER MEANINGS
2. Always right or correct in every situation.
No teacher is infallible, so she double-checked her answers.
3. In religion, unable to make a mistake about faith or teaching.
Many people believe the pope is infallible when he speaks about faith.
4. Something that never fails to work or happen.
Her infallible sense of direction helped us find the way home.