infallible
adjective | /infallible/
Advanced WordsHARD
not capable of being wrong or failing; certain to succeed
infallible
adjective | /infallible/
Advanced WordsHARDnot 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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