infallible
adjective | /infallible/
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
Antonyms
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.
Continue Learning
Community Stats
Track Your Progress
Sign up to save your favorite words and track your learning progress across all vocabulary types.
Take your English vocabulary to the next level
Vocabulary Builder is a smart and comprehensive English vocabulary app designed to help you learn, remember, and master words effectively. Whether you are preparing for competitive exams or improving everyday English, the app goes beyond simple definitions to ensure deep understanding and long-term retention.

