- 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.
- an infallible person or thing.
Origin of infallible
SynonymsSee more synonyms for on Thesaurus.com
1, 2. See reliable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for infallible
Even if he is, though, the pope may be infallible, but he is not omnipotent.Is Pope Francis Backpedaling on Gays?
November 19, 2014
Besides Diamond, some of the Saved By the Bell characters are portrayed as infallible angels.How Bad Was 'The Unauthorized Saved By the Bell Story'?
September 2, 2014
As long as they believed Saraswati was infallible, any dissatisfaction they experienced was a personal shortcoming.The Fugitive Guru
June 21, 2011
Buffett is not infallible and his hiding in the bunker does not make him appear stronger, wiser, or accountable.What Warren Buffett Needs to Do Now
April 1, 2011
To the vast majority of the devout, Pope Benedict XVI is infallible and the church has done nothing wrong.The Pope's Enablers
Barbie Latza Nadeau
April 12, 2010
Mrs. Turnbull's recipe, infallible for all aches, bruises, and strains.Tales And Novels, Volume 5 (of 10)
She is not so infallible a markswoman, but that she might shoot at a crow and kill a pigeon.Maid Marian
Thomas Love Peacock
Even the simplest of them—to do good to other people—is an instant and infallible specific.Pax Vobiscum
How, you clever and infallible members of this present generation, do you judge her?Priestess of the Flame
Sewell Peaslee Wright
This freshness, however, is not to be taken for an infallible sign of 7.Modern Painters Volume II (of V)
- not fallible; not liable to error
- not liable to failure; certain; surean infallible cure
- completely dependable or trustworthy
- a person or thing that is incapable of error or failure
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
Word Origin and History for infallible
Online Etymology Dictionary, © 2010 Douglas Harper