infallible

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

incapable of failure or error (Freq. 1)
- an infallible antidote
- an infallible memory
- the Catholic Church considers the Pope infallible
- no doctor is infallible
• Ant:
fallible
• Similar to:
foolproof, unfailing, inerrable, inerrant, unerring
• Derivationally related forms:
infallibility