Search Dictionary
Definition of infallible

infallible

/ɪnˈfæl.ə.bəl/
in · fal · li · ble
Adverb:infallibly
JUMP TO:

infallible Lexical Profile

infallible Game Scores & Validity

• adjective

1

Incapable of making mistakes or being wrong.

Example

"Even the most experienced doctors are not infallible and occasionally seek a second opinion."

2

Never failing; always effective or reliable.

Example

"She had an infallible sense of direction that guided the hiking group safely through the dense fog."

Synonyms
View all synonyms for infallible
Antonyms
View all antonyms for infallible

• Rhymes for infallible

• Nearby Words

inextinguishable
inextricably
infallibility
infallible
infallibly
infamous
infamously

Word Origin & Etymology

Borrowed in the late 15th century from Medieval Latin infallibilis, formed from the privative prefix in- ('not') and fallibilis ('liable to err'), from Latin fallere ('to deceive').

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Infallible. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/infallible
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.