Dictionary.com

infallible

[ in-fal-uh-buhl ]
/ ɪnˈfæl ə bəl /
Save This Word!
See synonyms for: infallible / infallibility / infallibly on Thesaurus.com

adjective
absolutely trustworthy or sure: an infallible rule.
unfailing in effectiveness or operation; certain: an infallible remedy.
not fallible; exempt from liability to error, as persons, their judgment, or pronouncements: an infallible principle.
Roman Catholic Church. immune from fallacy or liability to error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church.
noun
an infallible person or thing.
QUIZ
TEST YOUR MERIT ON THESE NEW WORDS IN 2021
The Dictionary added new words and definition to our vast collection, and we want to see how well-versed you are in the formally recognized new lingo. Take the quiz!
Question 1 of 8
What does JEDI stand for?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of infallible

First recorded in 1375–1425; late Middle English word from Medieval Latin word infallibilis.See in-3, fallible

synonym study for infallible

1, 2. See reliable.

OTHER WORDS FROM infallible

in·fal·li·bil·i·ty, in·fal·li·ble·ness, nounin·fal·li·bly, adverbnon·in·fal·li·ble, adjectivenon·in·fal·li·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use infallible in a sentence

British Dictionary definitions for infallible

infallible
/ (ɪnˈfæləbəl) /

adjective
not fallible; not liable to error
not liable to failure; certain; surean infallible cure
completely dependable or trustworthy
noun
a person or thing that is incapable of error or failure

Derived forms of infallible

infallibility or infallibleness, nouninfallibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK