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.
- in·fal·li·bil·i·ty, in·fal·li·ble·ness, noun
- in·fal·li·bly, adverb
- non·in·fal·li·ble, adjective
- non·in·fal·li·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use infallible in a sentence
They even threw shade at Taylor Swift and remained infallibly charming in the process.Golden Globes Hosts Tina Fey & Amy Poehler’s Funniest Moments (Video) | Kevin Fallon | January 12, 2014 | THE DAILY BEAST
The reader wishes to infallibly remember that the date of the beheading of Charles I. was 1649.Assimilative Memory | Marcus Dwight Larrowe (AKA Prof. A. Loisette)
I told you what would infallibly happen, and you know enough of the nature of the beast not to be surprized at it.Private Letters of Edward Gibbon (1753-1794) Volume 1 (of 2) | Edward Gibbon
For some day, he said, Nicky will bring out a volume of his poems, and in that day he will infallibly turn to me.The Creators | May Sinclair
In short, it would infallibly perish if abandoned before the age of three years.Buffon's Natural History. Volume IX (of 10) | Georges Louis Leclerc de Buffon
The continuance of hostility, with the determined refusal of security for these privileges, will infallibly bring on separation.The Loyalists of America and Their Times, Vol. 1 of 2 | Egerton Ryerson
British Dictionary definitions for infallible
not fallible; not liable to error
not liable to failure; certain; sure: an infallible cure
completely dependable or trustworthy
a person or thing that is incapable of error or failure
- infallibility or infallibleness, noun
- infallibly, 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