infallible

[in-fal-uh-buhl] / ɪnˈfæl ə bəl /

ADJECTIVE

unerring, dependable

Synonyms

STRONGEST

authoritative flawless foolproof unbeatable

WEAK

acceptable accurate agreeable apodictic certain correct effective effectual efficacious efficient exact faultless handy helpful impeccable incontrovertible inerrable inerrant omniscient perfect positive reliable satisfactory satisfying sure surefire true trustworthy undeceivable unfailing unimpeachable unquestionable useful

Antonyms

WEAK

erring fallible faulty imperfect

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The statute "does not treat as infallible the EPA's judgement as to whether FIFRA's midbranding provision has been violated," she wrote.

From Barron's • Jun. 25, 2026

Washington journalist Bob Woodward titled his mostly complimentary Greenspan book “Maestro” in deference to the Fed chairman’s seemingly infallible handling of the economy.

From Los Angeles Times • Jun. 22, 2026

They are never infallible or immune to misjudgment.

From Slate • Feb. 16, 2026

They aren't infallible but they will increase the hassle factor for criminals.

From BBC • Feb. 7, 2026

He was his own sarcophagus, a bold and infallible diplomat who was always berating himself disgustedly for all the chances he had missed and kicking himself regretfully for all the errors he had made.

From "Catch-22" by Joseph Heller

Vocabulary lists containing infallible

The Vocabulary.com Top 1000

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

ASVAB Word Knowledge

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

"The Odyssey" by Homer, Books 1–7

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!