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infallible

adjective | /infallible/

Advanced WordsHARD

not capable of being wrong or failing; certain to succeed

Learning Progress

Synonyms

unerringflawlessperfectfaultlessunfailing

Antonyms

fallibleimperfectunreliableerring

Examples

"No human system is infallible, however well designed."

"She viewed her mentor as almost infallible in judgment."

Mnemonic Trick

INFALLIBLE → IN + FALL (not): not able to fall — cannot be wrong.

Etymology

From Latin infallibilis “not liable to fail.”

Used for things or people considered incapable of error.

Source: Advanced WordsAdded: 9/28/2025

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Active Learners60
Words Being Learned103
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