Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

infallible

play
adjective in·fal·li·ble \(ˌ)in-ˈfa-lə-bəl\

Simple Definition of infallible

  • : not capable of being wrong or making mistakes : not fallible

  • : certain to work properly or succeed

Source: Merriam-Webster's Learner's Dictionary

Full Definition of infallible

  1. 1 :  incapable of error :  unerring <an infallible memory>

  2. 2 :  not liable to mislead, deceive, or disappoint :  certain <an infallible remedy>

  3. 3 :  incapable of error in defining doctrines touching faith or morals

infallibility

play \-ˌfa-lə-ˈbi-lə-tē\ noun

infallibly

play \-ˈfa-lə-blē\ adverb

Examples of infallible in a sentence

  1. I never claimed to be infallible.

  2. There is no infallible remedy to these problems.



Origin and Etymology of infallible

Middle English, from Medieval Latin infallibilis, from Latin in- + Late Latin fallibilis fallible


First Known Use: 15th century


INFALLIBLE Defined for Kids

infallible

play
adjective in·fal·li·ble \in-ˈfa-lə-bəl\

Definition of infallible for Students

  1. 1 :  not capable of being wrong <an infallible memory>

  2. 2 :  certain to succeed :  sure <an infallible remedy>

infallibly

\-blē\ adverb




Seen and Heard

What made you want to look up infallible? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a jerking and twitching of the body

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

two-chairs-on-a-pier-by-the-ocean-in-summer

Which of the following words means “of or relating to summer”?

brumal vernal estival hiemal
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ