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

That is not to say humanity is infallible.

From Slate • May 28, 2026

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

From BBC • Feb. 7, 2026

Priority disputes are an infallible indicator that knowledge has become public, progressive and discovery oriented.

From "The Invention of Science" by David Wootton

Vocabulary lists containing infallible

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"The Odyssey" by Homer, Books 1–7

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