Definition of infallible
- an infallible memory
- an infallible remedy
I never claimed to be infallible.
There is no infallible remedy to these problems.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infallible.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Watch out when you hear about infallible predictions, an infallible plan, an infallible cure, or even infallible lip gloss. Infallible isn't a claim that scientists, engineers, and doctors like to make, so you're probably getting better information when the word not comes first. You may have heard the phrase "papal infallibility", which refers to the official position of the Roman Catholic church, adopted in the 19th century, that certain solemn statements made by a Pope about faith or morals were not to be questioned. Popes since then have been careful not to make many of these statements.
First Known Use: 15th centurySee Words from the same year
: not capable of being wrong or making mistakes : not fallible
: certain to work properly or succeed
What made you want to look up infallible? Please tell us where you read or heard it (including the quote, if possible).
Merriam-Webster's New Words Quiz—Fall 2017 Edition!
Can you spell these 10 commonly misspelled words?TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.TAKE THE QUIZ