incapable of failure or error; "an infallible antidote"; "an infallible memmory"; "the Catholic Church considers the Pope infallible"; "no doctor is infallible"
If a person or thing is infallible, they are never wrong. Although he was experienced, he was not infallible fallible + infallibility in·fal·libil·ity exaggerated views of the infallibility of science
A state achieved by an individual, and through Allah's grace, which gives the individual complete freedom from the possibility of being in error The prophet, his daughter Fatimah and the 12 Imams are infallible
Not liable to fail, deceive, or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy